If you follow Alex3917's link, you'll see he argues that Nutt is intellectually dishonest. That's of course different than being regular dishonest (i.e. fraudulent).

I think if that was really the case then IC would still want to know, I wasn't kidding about them being one of the most prestigious institutions in the UK.

Indeed, having been offered an academic job at Imperial, I'm partial to thinking of it as a place of high prestige.

The thing about intellectual dishonesty is that it's not provable, and in fact usually isn't even noticed by people who agree with the conclusion. If you read the link, you'll see that these allegations are hardly the kind that would lead a university to remove a professor.

We don't need to follow the link. This comment said the research was "entirely fraudulent". Amusing that his actual argument said something rather different.

Poor choice of words, but I don't think that's enough to justify ignoring his criticism.