How it is impossible ? Please elaborate.
He already elaborated several points.
For Bangladesh like incident to happen you need a few contributors :
1. Extreme grievance among significant number of people. Missing here. Except those whose bread and butter is politics, very few people has extreme grievance against the Govt. unhappy doesn't equate to grievance. And mullahs don't count. As a matter of fact if mullahs unite, the majority hindus will unite too in counter. See what happened in MH in last election? The loud demands of mullahs to congoons counter-consolidated Hindus to come out and vote giving Mahayuti a landslide victory.
2. Inability of the incumbent party to counter-mobilise is also another thing that contributed in Bangladesh'es case. BJP doesn't lack in mass power.
3. Ineffective rule of law. Bangladesh never had effective rule of law. Their constitution itself is a farce. In India people might not like how the law works, but most people at some level abides by the law. So, you will be hard pressed to find the overwhelming number that will be needed to bear down the Govt in centre. Even Indira Gandhi couldn't be weighed down despite her becoming thoroughly unpopular. Even during the popular movement led against Indira, the massive protests rarely turned violent. She ultimately was thrown out through election defeat.
4. Size of the nation. Dhaka being the both political and economical capital of BD, it was easy to seize and cause destabilisation and spread it through BD. India is not concentrated in Delhi only. Even during CAA and so called farmer's agitation, nothing changed in India except for few people living near the protest sites. Nobody cared enough to cause even a stir in the economical front of India. For such effect simultaneous seizure of Mumbai, Delhi and other metros have to happen. But given how politics and motivation is always different in each metros due to language and regional issues, how likely is that?
5. Leadership of the opposition is also a primary factor in such a mass agitation to build up and then persevere before it finally succeeds. In BD, the leadership was effectively hijacked by the mullahs from the so called students soon after the protest entered violent phase. Mullahs provided jihadis as foot soldiers in huge numbers who hid behind the students and did the actual violence. Both Jihadis during CAA and Khalistanis during farmers' protest tried it in Delhi, but massively failed both times.
6. Breaking the foreign hand is always a factor to nip such efforts at the bud. Hasina couldn't do that because BD is heavily reliant on foreign investment. India too is dependant on foreign investment, yet it has built its own economy at such a level that it can stare down the foreign govts. Hasina wasn't successful in countering CIA-backed Soros'es pets from causing the trouble for her. She couldn't coz she was facing a sudden economical upheaval resulted out of Covid. Her economy literally depended on the orders from overseas by MNCs who are largely controlled by Soros'es cabal. India has gotten big enough that they can take such actors to task within India and send message across the ocean to their masters. Heck, India in recent time has been turning into Dragon diplomacy of China where so called developed nations are regularly taken to task for their hypocrisy.
7. Now, about the security matters. The CAPFs are powerful enough to control any mass agitation in India. India is not reliant upon army like BD. In fact, army within itself has enough check and balance to negate concentration of power under on CoAS and by extent to negate chance of any coup. The CoAS is an administrative head when an Lt. General takes care of DGMO and there are additional 5 commands that effectively control the troops. Even to pull an unofficial coup like BD, CoAS has to take in confidence senior most officers of Central and Northern Command including Vice Chief and DGMO. Military discipline alone wouldn't have such senior officers nodding to CoAS'es unconstitutional orders in India. And forget about some Corps commander to pull a coup.
8. As for the concern about certain ethnicity or religion based regiments trying anything, since HQ of most such regiments hardly ever is placed in their native, they wouldn't be able to gather enough logistical support to cause anything more than a stir at best before they are subdued. Also, the various regiments are united only by their ethos of patriotism toward mother India, and their ethnicity, religion and interest is diverse enough that the jehadification that has happened of BD army, is impossible for Indian army.