Does he? I thought the point of his talk [1] was that we developers ascribe way too much weight to few, small studies. So rather than saying that we should dismiss the claims, we should instead take great care because the claim may not be generalizable at all.
[1] https://www.hillelwayne.com/talks/what-we-know-we-dont-know/
> A lot will be from before 2000, before we had things like "Agile" and "unit tests" and "widespread version control", so you can't extrapolate any of their conclusions to what we're doing. As a rule of thumb I try to keep to papers after 2010.
While I admit that even in the late 90s, it seemed strange to me to see citations from the 70s or 80s about projects from the 60s (like, say, OS/360), I'm not convinced that so much has changed in the last ten to twenty years as to render all previous research irrelevant.
https://en.wikipedia.org/wiki/Test_Anything_Protocol#History