The CEO is the sales guy. If you have worked in B2B places before, very often the CEO is completely non-technical.
Sales is about navigating conversations to match someone's problem to a solution. Product is about navigating conversations to understand problems and figure out what the solution should be in the first place.
I do know one CEO who is "the engineer". They're in a bit of a weird market, and it seems to be working. I rather expect he'll move to a CTO role once they're actually in production, though, when the focus becomes growth.