"Engage through mechanics" sounds like a really, really, really mild version of gamism. Which generally matches overall with this stuff.
I would say that I agree that gamism is sort of the....how to put it without giving it special privilege....how about "naive" agenda? Because, whatever else these things we call tabletop roleplaying games might be...they wear the "GAME" part on their sleeve. That's the thing everyone knows about, and it carries certain assumptions, especially in this world where we now get commercials about products for adults that are clearly "HEY FELLOW GAMERS, YOU GAME TOO RIGHT? WE ALL LOVE VIDEO GAMES HERE". (15-20 years ago, you'd NEVER have seen these kinds of commercials, it's kinda funny how I dropped out of watching TV for a while and the difference is stark.)
Once players get exposure to what TTRPGs can do, if they become enfranchised, they may decide they really like one agenda or another.