No, it doesn't imply that. It acknowledges that Trump being a racist is something that is not an uncommon belief and is something that could keep some white voters from voting for him.
Personally, I have no reservations saying Trump is a racist, but I'm not the original poster so many of you are willfully misunderstanding.
"To allow white people to think they're not voting for a racist" certainly does.
If he meant it the other way he could've easily said "to help dispel notions he's a racist" or "to eliminate the false meme that he's a racist"....
Either way, believe what you want.
I'm not voting Trump because he's a loon, but I'm not going to label him a racist because liberals keep repeating it.