@chuck: Your question of "does Danny measure these speakers in an anechoic chamber?" suggests that you have not actually watched many of his videos. If you had, you would know the answer to that question.
You make an argument against Danny by theorizing "I am sure some of the components have deteriorated or drifted. Also, manufacturing has gotten much better. Components are held to tighter tolerances and measuring equipment has gotten much better." These are what we call specious arguments., the answers to which dispel your theories.
Have you watched the video I just posted above? You really should, it’s full of a lot of accumulated speaker design wisdom. If you haven’t watched it, your opinion is of limited credibility and gravitas. IMO.
It’s not a question of whether or not a person "believes in Danny", but rather if what he says holds up to serious scrutiny. We are all free to make that assessment for ourselves.