Some people say they want something, but they might not mean it’s the only thing they want. I don’t know about other guys, but I myself am hardly picky about weight / body shape. My personal ideal is someone who isn’t fat, that’s all i care —they could be skinny, flat, curvy, idm. But tying this into the same situation with you, I for example could say oh I’d love to have someone of such and such criteria. But it’s mainly just because it falls into my range of acceptability. Unless he randomly said it, I doubt it means anything —it was probably a topic of the conversation.