I don't think it's necessarily the pandemic. We had one cruise in 2021 with a cruise staff member named Gus on the Wonder leading the classes and he was PHENOMENAL. Last year on the Dream in Europe we literally had Don "Ducky" Williams leading a class, which was a total treat. In January on the Magic we had a cruise staff team member leading who was quite good. I can't remember her name.
So really it could be either. I mean, they need to just happen to have a member of cruise staff onboard and available that can draw a variety of characters from memory reasonably well. All those elements aren't necessarily always going to align so it's nice that they have the videos now instead of not offering them at all (which is what they used to have when nobody could teach it).