Wilder weighs about 215 pounds, Mcgregor is walking around at 180 now according to everyone on sherdog.
McGregor is a brown belt in BJJ and, despite what all the people on sherdog like to shittalk about, he legitimately is a master martial artist with an expert level understanding of every aspect of MMA and fighting.
The ~30 pound weight difference is not enough to overcome the vastly superior understanding of submission grappling and BJJ that McGregor has over Wilder.
In reality, McGregor, as well as every other guy who fights at 155, would beat Deontay Wilder in an MMA fight 9 times out of 10. Wilder has a punchers chance, of course, but overall he would lose to these 180 pound men who fight at 155.
Only an incel would deny this.