There is a standard copy-paste argument that keeps getting repeated to cast doubts on that piece of data - that, sexual assaults are disproportionately underreported in India compared to 'other nations'. Not that this argument has much literary basis but anyway....
In fact, India records more than 90% of its deaths accurately and records it on the AADHAR database - which immediately rules out the possibility of the existence of a significant no of unaccounted deaths which in turn suggests relatively low prevalence of violent crimes (including, but not limited to sexual assaults).
Lastly, reporting across Indian media is generally crime heavy (unlike gora media, which is politics/op-ed heavy). The Pune road rage incident stayed on news for weeks. Then there was that RG Kar incident. Now, the suicide of Atul Shubhash is making frontpage headlines in national dailies.
Think about this. If they (the phoren mideawallahs) started reporting every time a mass shooting incident takes place or a pedophile/pedophile ring is busted their front pages would run out of spaces. You are extremely unlikely to witness the kind of media trials, candle marches or activism over a hit and run case or a rape in goraland we are accustomed to in India.