I don't see how Battlefield: Hardline is a casual game
that all depends on how you qualify a casual game, i guess. i would say the only casual games are phone games and multiplayer party games like Mario Cart and the like.
I think the way he means it though is that it's a mainstream, yearly release game with a lot of players. And what he says is true, games like that generally have smaller PC playerbases as opposed to console.