But he was lying. That's different. What you're making is irrelevant, and if it is for them (i.e. the company you're interviewing at is making an actual problem

But he was lying. That's different. What you're making is irrelevant, and if it is for them (i.e. the company you're interviewing at is making an actual problem of not knowing), then you don't want to work there. What you're looking to make is much more relevant.