Yes , battle star gallactica is also one of those "secretive" project by India.
Apart from usual nationalist Indian media rhetoric , there is nothing credible out there which can suggest that India has mated the missiles with subs and by going the track record of Indian Navy and handling of its subs, its more case of usual chest thumping.
This is how SLBM is tested, do you see any pontoon?
check this tweet by Indian PM Narndra Modi you dont go more Official than this.
Arihant has completed multiple Deterrence Patrols from past 2 and half years