Ok so he comes up with the idea for the experiment and gives it to a grad student/post doc to do the experiment. So whose idea was it?????? That is why his name goes on the paper. It was his idea in the first place.
What they don't accuse Raoult and his co-authors of his fraudulent results or sloppy work or trivial experiments which would be the only legitimate complaint.
None of this goes to the underlying question - does the stuff work or not? The ad hominems are irrelevant.
According to one critic
Through the eyes of the grad students actually doing all the "work", I'm sure that's how pretty much all university research projects look. In reality, I'll bet Raoult is contributing a lot more than his signature.