I am well aware of the Royal Society, and I agree with your characterization of its membership. But why should I be intimidated? Even the most brilliant people can make mistakesand I think this statement of theirs is a mistake.
By the way, if your comment about "non-scientists" was meant to include me, you are mistaken. My dictionary defines scientist as "a person learned in science and esp. natural science: a scientific investigator." I certainly qualify as a scientific investigator, although my degrees are in engineering.
In general I wouldn't qualify engineers as scientists. A Ph.D. in science is a course of training and aprrenticeship in research. If lack that training, you lack a qualification.
I find it significant that so any anti-evos are engineers or programmers, and so few are actual scientists.