I think it is safe to say the IAF has sufficient coverage to pick up a T7
IAF scrambles Su-30MKI after spotting UFO near Amritsar border - Worldnews.com
There seems to be some weight age to the flight swinging south and headed towards Australia. Given the timing , location and the gaps in radar it has penetrated this was done by someone with explicit knowledge and precision timing. Would find it hard to believe crew rest room door opening at opportune moment of handover and all other aspects given general awareness post 9/11.
If it is a man made event it definitely has an inside hand.