No, Fire Emblem is not advance wars because units die permanently. You don’t manufacture new units in battle. Characters level up like an RPG. There is grinding. You can level up so much that the tactics don’t even matter so much. Combat is rock/paper/scissors. There is no resource management game.
X-Com isn’t advance wars. You don’t manufacture new units. In Advance Wars you take your entire turn, then opponent takes their entire turn. X-Com the individual characters have initiative. The characters also level up and such, so there is a little grinding, but not like Fire Emblem.
Battletech on the PC is very very close to X-COM.
Into the Breach has some of the puzzle elements of Advance Wars, but not the resource management aspects.
Warbits is Advance Wars. Tiny Metal is Advance Wars. They just aren’t as polished and great as the actual Advance Wars.