I think that's an overstatement. It's not 'marketing before intellectual honesty' to point out that we should be extra-wary about analyses or materials by ideologues for whom the results are part of their identity (Sailer repeatedly talks about white identity and how it's a shame there's no White-with-a-capital-w solidarity in the way there's Black-with-a-capital-b solidarity) which is just one of the many deductive fallacies with perfectly valid statistical justification for using, or that quoting approvingly such people will ceteris paribus put off other people with extra reason to distrust such people.