I don't believe that to be true, but all I've got is an anecdote: Despite the fact that my posts probably contained the most linked sources out of everyone here, I had a mod give me a time out with the line saying something like "I get that condescending bully shtick is your thing..." when I was replying with a short quip to a known troll that never contributed anything meaningful to a conversation. Can I be condescending to a worthless poster? Yep. Guilty. If someone posts unsubstantiated garbage and propaganda-like one-liners while never actually engaging in a meaningful way, I'll occasionally respond in kind which I'll admit is a mistake. But I've started a few well sourced topics, brought a lot of sourced information into serious topics, and frequently engage in thoughtful discussions, so it was utter BS for a mod to say "bully shtick" is my thing. If the mod had stuck to giving me a time out for being condescending, I'd have been fine with it. But that mod crossed a line with that accusation.
I tell this story to combat your narrative that the mods have been manipulated into a bias against people who continue to support trump. I'm not saying a bias swings the other way, but the unwarranted attacking shot in the explanation indicates there is certainly no bias favoring anti-trumpers. Hell, I think the mod even said "if you don't agree that's what you were doing, find another board." Wtf? I absolutely agree I was being condescending, but I also absolutely disagree that my posts here are bullying or that my posting could be classified as "shtick." I didn't take the time to link my sources just for fun. I've stopped doing it as much, because it's clear people don't even bother to click on them, but back when I got the warning, I was very deliberate about sourcing all my data.
As for warnings/time outs, if anything, it sounds like trump supporters are the most thin skinned and trigger happy when it comes to reporting. Perhaps, there's a bit of chicken little going on here, but I honestly don't think so. Moderation will never be perfect. There will be missed time outs at times and heavy handed time outs at other times. You probably just notice it more when one of the minority goes missing than one of the majority.