I mean, he clearly (and conveniently) gained all of Homelander's abilities save for flight--or at least as far as we know he doesn't have flight. So if Homelander is immune to his laser eyes, why wouldn't he be?
They (including Ryan) are also not the only ones to have developed that particular ability. The baby Butcher weaponized in season one had them, too. I imagine "laser eyes" includes "immunity to laser eyes," else they'd be fucked the moment they used it.