When I'm having a discussion with someone who isn't clear on the Scientific method, or whether science can find the truth, as the people in the article, I'm on pretty safe ground. Although, yes, in theory, they could convince me of their views that homosexuality is a mental illness, etc. I think the odds are poor.
The article implicitly assumes that a scientific determination of the truth has been made. (Which is problematic in itself. Bad science gets published all the time.)
It depends on whether your goal is to determine the truth or to convince someone of your viewpoint.