Some Tory voters are racist. That's because Tory voters are a large group of different people. Fun fact - some West Ham Utd fans are paedophiles, and some ginger haired people are actual Nazis. Doesn't tell you anything about West Ham Utd or ginger people in general.

My view is you have to question the motives of any POC who runs for the Tory party.
Honestly, I think this is racist thinking. Not conscious, nasty racism like hate. A different kind of racism. It quite literally shouldn't matter to you, any more than a Tory voter, whether he's a POC or not. But you're thinking about that when passing judgement. You're applying expected behaviour and thinking to an individual based on their skin colour. I find this uncomfortable an unhelpful.

I've never heard any of them say "I want to be a Tory to improve the lot of POC."
Again, why should he be thinking about this? If he's going to be the leader of the Conservative Party when they are in power, then his job is to represent everyone, to balance the interests of the entire population, not just people who share his skin colour.