There are also likely people who are satisfied that he won the election who don't like Donald Trump and chose him as the lesser of two evils. (EDIT: or as you suggest, voted for Kamala even)
CBS YouGov (I read the crosstabs yesterday after Holic shared them) conspicuously DID NOT ask a question on favorability, which is what I'm talking about - I suspect that number would be lower.
Now, once they go out and take approval polls now that he's in office, we'll have to see how that goes.