I think he’s doing a disservice to the finer art of audio by teaching that measurements are gospel. Basic measurements are a convenience and are a good starting point, but are not the entire answer. Machines simply can’t measure the same subtle nuances that human ears can hear. Listening a skill that can and should be learned and honed. Relying solely on measurements squelches listening skills, and it equates to a paint by numbers result.
Double blind testing has limited value too, because it can’t replace the benefit of long term listening sessions on your own system in your own space. Especially if the differences are subtle.