Voting by user is against the rules of Stack Overflow; if you intend to upvote this user's posts in order to reward them, the votes will be reverted and you might face disciplinary action.
How would the platform distinguish those votes from regular ones?
As a network moderator, I actually know the answer to this, so I'm not going to openly speculate. Suffice to say, the rule is there for a reason (voting-by-user messes up the ordering of answers to each individual question), so please don't try a clever workaround just because you think you can.
Navigating to an answer from the user's page only "shadow votes" it for you, it doesn't get counted.
As a YouTuber, this has happened to me multiple times. It's fans or people trolling, they always remove the points though.