Bret Weinstein has also been making wild, alarmist claims about mRNA vaccines. He's not a credible scientific voice at this point.
He's presented ivermectin as a miracle drug that is "something like 100% effective" at preventing CoVID-19, and said that people should take it instead of getting vaccinated.
In other words, he's an obvious crank who is giving extremely dangerous medical advice to a very large audience.