Earlier quoted context omitted.
The argument is that the amount of attention paid by scholars does not make a field of inquiry more or less valid. It does apply to all science. Do you think science does not suffer from fads and community bias? When did we move past that? Even a very rigorous field like mathematics suffers from these problems. Cf. Mochizuki getting published in Nature or the controversies about the foundations of symplectic geometry…
If you are just trying to make the argument that science has made mistakes, there is no argument, I agree. So theoretically relativity and Newtonian physics could be untrue. But it's highly unlikely. I would argue that a combination of the simplicity of study of a phenomenon, the amount it's been studied, and the consistency of the results of that study correlate with the likelihood of it being true. IQ is very simpl…
IMHO, the most biting criticism of IQ is that we (that is the psychology community at large) expect such a thing to exist, and so we treat anything that looks like it might fit that glove, no matter how poorly, as evidence of its existence. Our scientific methods aren't really capable of forcibly rebutting such a theory--see the existence of parapsychology, where psi is statistically known to exist (unless you're a skeptic). See https://slatestarcodex.com/2014/04/28/the-control-group-is-o... for a discussion of this phenomenon.