See, I generally prefer more simulation that D&D offers, which is one reason why I play and enjoy Burning Wheel and Torchbearer 2e.It is frustrating how these discussions go:
"I think I'd prefer a tad more simulationism than a game X offers"
Then I get told they're not simulationist, whereas D&D is!
Given that both systems have bucketloads of process sim (in PC build, in action resolution) compared to D&D, I conclude that for the poster in question "simulation" means "backstory/setting only ever flows from GM to players".