Rumor mill and math job
I am a professor at a top 20 school in mathematics and I have been on our department's hiring committee for the past several years. I can assure you that we take absolutely no notice of the contents of that particular website when making decisions. We consider ourselves competent enough to form our own judgements on any particular candidate. In the past, we have interviewed plenty of people whose name occurs frequently on that list, and plenty of those whose name does not appear at all.  Moreover, the accuracy of that website is dubious at best; at my own institution it sometimes lists people who are not at all under consideration, and usually doesn't list people who are - including those who have been given offers. The only time I made any attempt to edit the website was when it claimed that we  didn't have any positions available at all (which was false). I suspect that at least on one occasion someone invited themselves to our institution to give a talk and then put their own name on the website as a candidate (they were not). Thus, I suspect that the effect this particular website has on job offers is minimal at most.