It's funny. I went out of my way to de-politicize the question in order to further the discussion and you promptly re-politicized it in order to muddy it. I suspect it's because you know exactly what I'm getting at. You've avoided the core question no less than 3 times already.
I'll try one more time. Please resist the temptation to play word games or make it political:
If Twitter has limited fact-checking capabilities is it not correct — regardless of politics — to direct those resources where they are more effective?
Therefore (again, regardless of politics), Twitter's actions follow perfectly reasonable logic: that Trump's Tweets would face more scrutiny than say, mine.
Thus, your claim that "the rules are being enforced selectively" can easily be accounted for by Occams Razor: It makes perfect sense that more visible accounts face more scrutiny. It would be highly illogical for Twitter to do otherwise.
It is not.
That is all.