FAA policy is that ADSB is the future of ATC (in place of radar) and already uses ADSB data for the SASS project to monitor ground and near-field movements. SASS is already in use at a handful of US Airports - therefore I assume it is certified and approved.
SASS uses a dedicated ADSB receiver on the airfield, and collates the ADSB-out data from aircraft, ground vehicles (if fitted) etc, and merges these with e.g. tower radar data. It is not using any of the public web-based ADSB interfaces, because as you say, data can be spoofed by bad actors (I have seen the Starship Enterprise NCC-1701 taxying around RAF Brize Norton, for example!).
The near-miss at Austin, and the NTSB (& Congress) investigations may well recommend an acceleration of the implementation of SASS, as an additional layer of swiss cheese. As SLF, I certainly hope so.