

Maybe the explosions played a role in the term being used like that but I’m fairly confident age is the primary dimension here.
Heck I’ve seen people use “boomer X” to refer to older-meta versions of decks in magic the gathering. Decks which had zombies not explosives.
It always felt obvious to me that it was a metaphor, I didn’t think I’ve met someone who legit believed boomer shooters were boomer games.
Most boomers, I think, were too old by the time video games were exciting and commonplace to start drawing numerous people so it’s fairly rare for a baby boomer to be a gamer.