James Tour seems to be becoming a favoured go-to for antievolution types.
Dr. Tour is a noted and leading organic chemist, to be sure - but he’s not well informed about evolution, alas. His usual angle is to ask exactly how evolution works at the level of organic chemistry - molecule to molecule, as it were - where there is very little knowledge at that level (there is some, but not much). He also avoids the abundant evidence we do have for evolution at other levels.
If I wanted to, I could ask Dr. Tour to explain the chemistry of bond formation at the level of elementary particles - how do quarks and muons, for example, interact when bonds form or break? When I’ve put this question to organic chemists I know, they say they have no idea, and that no one has an idea. They know they’re in there, but they don’t know how things happen at that level of detail.
Now, if I were to give a lecture about how “there is no known mechanism for bond formation” because no one knows how muons do their thing do you think that would be sufficient to cast doubt on organic chemistry as a whole? That’s the equivalent of what Tour is saying here. He’s also not speaking to an academically trained audience - rather, he’s speaking to Christians who are predisposed to uncritically accept his statements on evolution because they themselves already doubt it or reject it.