Generally, the top tier missile testing by DRDO is very much shrouded in secrecy for long time. I had an conversation with an NAL scientist known through our relative during 2018 after the first SFDR launch. While the official media news is the Missile failed but he simply told the test was indeed successful and DRDO simply withhold the information.
Also, we came across dozens of Prithvi missile testing for decades now. Prithvi is such an old missile and it is pretty much we can speculate that DRDO is testing some new missiles but just simply not providing any tidbits to common people.
Same situation is going with SSBN and SSN a lot of manufacturing infra is upgraded in HSL but we rarely heard about them compared to MSL, GRSE, CSL ship building capabilities. The subs activity also very much in secrecy and we are getting tidbits in a very delayed fashion.