Suspect this is the video you're thinking of :
https://youtu.be/zYijmX8UzQ0?si=HRqMvreMovaAB43z
This was while he was playing keys on the GATS tour. I suspect he hasn't done much live work since which is a different beast to doing stuff in the studio where you don't have protools or Nasmyth to come in and do a better take . Speaking of which, sending good vibes Nicks way, coming up soon on his 30th anniversary with the band. Probably doesn't get enough credit from the fan base for what he contributes in the studio especially on Lifeblood and TIMT.