FCL.745.A Advanced UPRT is a prerequisite only for ATPL issue. It may be completed either during an integrated course or as a standalone course flown with certain training providers.
It is emphatically NOT an aerobatic course; however, aircraft used for the course should be suitable for the task and it makes sense to use something like a T67 to afford greater protection should a training event go awry.
I once saw a videoclip of UPRT 'training' conducted by some American in an Extra 300. He talked incessantly and concentrated on sudden departures from controlled flight. Some of the worst flight instruction I've ever seen.
However, stand by for news from EASA next month. While Advanced UPRT in light aeroplanes and basic UPRT during CPL or MPL courses is going fine, recurrent training for ATPL holders is highlighting a severe lack of qualified full flight simulators certified as capable of replicating UPRT elements accurately... So some form of deferment is likely to be announced.
Frequent 'stalling' of multi-pilot FFS is likely to knock hell out of them. No doubt this wasn't taken into account when this whole UPRT elephant in the room was agreed.