Given that it is actually possible to implement this idea, I imagine medicine professionals would appreciate it, and there should be enough to make his startup

Given that it is actually possible to implement this idea, I imagine medicine professionals would appreciate it, and there should be enough to make his startup viable. When talking to doctors, he's not selling his idea or service - he has to first sell his own credibility, and then the credibility of his service. He is claiming that the intended/unintended effects of medicines can be coded into a big searchable table, that his "contractors" have done this, and his service is now usable and valuable. This too bold a claim, especially from "some random guy". That's why none of the doctors were interested. In his blog post, he's assuming his product actually has value, but somehow has opposing stakeholders.