Since the article doesn't mention test power (and should it be for the reason of rebuttal of that Pearson-Neyman concept) I don't think it's a worth read. Sorry

Since the article doesn't mention test power (and should it be for the reason of rebuttal of that Pearson-Neyman concept) I don't think it's a worth read. Sorry. "studies with small sample sizes can be very valid." They could be with a certain probability but (unless you believe in a very strong prior) you can't know with sufficient certainty.