Look, it's not like Spacey's been insisting that he's heterosexual this whole time so he has to address some kind of bombshell revelation that's uncovered by the allegation. We all knew he was gay. He knew everybody knew he was gay, he said so himself in that statement. He's just a dude who refused to talk about it even when someone pointedly asked about him being seen going on dates with men, which he had every right to do. So yeah, he could've easily made the same "I was drunk, I don't remember" excuse while maintaining his usual non-acknowledgement of his sexuality. He chose to conflate the two things by talking about them in the same statement.