"I've no idea," he admits. "I have very few and very, very vague memories of being human and none of them involve coffee, or alcohol," he says, dryly. "Nor do I expect I'd ever had either."

There is definite, solid, confirmation of fact in there.

Though he is a devil so he could be lying and reciting a rumor he knows. Could have started.

It's neither but technically possible and he will lean into that deniability should he be given any reason at all.