It is a great tool no doubt. DSNA in France went full-on ripping out CAT I and uncategorised ILS all over the place where they could publish LPV200 approaches.
My experience with Airbus at meetings like this is that it can veer towards marketing. From what I've seen attending various working groups and workshops there's not even any discussion about it (I think those slides are from the 2019 GSIW in Soeul....certainly recognise them! I was a 'virtual' attendee as I couldn't get anyone to pay for my travel(!) Bit annoying having to sit there at home waiting for a webex to start at 2am).
GBAS CAT II/III SARPS were agreed back in 2010, and we're only now seeing operational CAT II approaches... CAT III still a few years away. I'm very sceptical on SBAS being used for anything other than CAT I (perhaps LTS CAT I and OTS CAT II). Will 'virtually' collar someone from Airbus soon (next International GBAS Working Group is coming up in San Franciscoin a few weeks).