Well no really,

The issue here is the implementation of the Audio Drums. If the Yamaha Audio Drums can't edited (they can't be edited, deleted or created from scratch) then the PSR950 users will be limited to use audio drums in styles created by Yamaha.
No the case in the audya where you can take any MIDI base style and create a new one by inserting audio drums on it. You can replace for example an 8 beat style for a 16 beat one in a couple minutes and that is only a small example of all the things that you can do with audio drums in the Audya.
At the end you are going to have to purchase so many audio styles and voice and expansion packs from Yamaha, that the final cost will be the same as an Audya and you don't have to reboot !!!
And remember the Audya have audio guitars samples too.
The next Tyros, Tyros 5, will have the same limitations as far as editing.

The demos won't change the implementation.

At the end of the day yamaha knows
They will sell a s**tload of s950
Anyway so that's why you're not getting
Ketrons way of doing it

At this point, not many, other than those directly associated with the developing and demoing of the currently unavailable S950 know exactly, the limitations this MOTL may, or may not have.

And for sure, except for a very select few, know the future of the next TOTL Yamaha arranger, and what limitations it may, or may not have. It may not even be called a Tyros 5