You were thinking of WoD. Don’t pretend otherwise.
Also don’t confuse the natural decline of WoW subs over time and the ebb and flow of new expansions and those ending as proof of PvE participation relative to the entire game population.
There is also nothing from Holinka’s quote to make you assume he is only speaking of that brief moment in time with regards to numbers, and there is no logical reason to assume PvE players would quit but PvP players wouldn’t to a significant enough degree that it would grossly skew the numbers.
In fact if you are just looking at sub counts it could be just as true that PvP players quit en masse for any number of reasons and the disproportionate number of PvE players stayed subbed yet still PvP participation was equal to PvE participation. There’s no real reason to believe this, but if we are making stuff up to fit our agenda I can do it just as easily.
Anyway here’s a graph I found. That period of time wasn’t the lowest participation ever and there’s certainly nothing at all to indicate whether the subs are of PvE or PvP players: