Robinson is trying to gaslight everyone by claiming that he didn't write the posts. He even claimed that AI technology that didn't exist when the posts were written framed him.
I think Trump will do a combination of, "I don't know anything about it, but Mark is a terrific person," and, "He says aliens wrote the posts and he says it very strongly, so you'll have to look into that, but what I will say is that Ka-MAH-la is genetically a tapeworm and this country has gone to hell and the only way you're gonna get it back is to elect me for life and buy more of my merchandise. Go to I'mAn Idiot.com, put your credit card number in, and be prepared for the most crooked election in the history of our country."