Absolutely not. Identity voting is very real. It's a big reason why Trump appeals to the WWC as well (not that Trump is WWC himself, but he behaves like one, which is what is important). But it is also a main reason why more "cerebral" candidates like Buttigieg or Warren overwhelmingly appeals to the highly educated. People do like to vote for people that they can identify with. With Kanye it is not just his skin colour, but certainly attachment to hip-hop culture and his larger than life celebrity personality.
BTW, I am NOT saying that black people will vote for Kanye in droves, but it is possible that he siphons a non-insignificant part of the black vote away from Biden.
He's said slavery was a choice, praised Trump, and adopted confederate symbols--do you honestly think black voters who are against Trump are going to look at this and think Kanye is the better alternative?