My two cents, from a tactical perspective they might not. The average Clan Mechwarrior might not know what it is, and it's possible after the design being extinct for so long that modern computer recognition systems wouldn't know it either. So during its fight, it's just another Mech, if a mysterious one.
Now, if battle ROMs make it back home and some historical researcher realizes what he's looking at, all bets are off, naturally. But actual boots-on-the-ground, it may remain anonymous for the battle.
Then again, who knows, maybe the computers would still recognize the shape and call it what it is. Stranger things have happened.