That said, even without seeing his face there’s certainly evidence to support the notion that it’s Affleck’s mug under the mask.
Bruce Wayne spent years studying the art of stealth and disguise, but Ben Affleck’s not quite as skilled in that field.
Couple that with the security detail walking with him, and we are willing to bet that this is the Justice League actor.
The guy is easily one of the tallest actors in the DCEU, and he has remained fairly well-bulked up with muscle since taking on the role a few years ago.