That’s fair, however the overall gist of the post seems to imply that the numbers data and numbers produced somehow groundbreakingly prove that everyone who has proclaimed it works is wrong and the data and numbers in the post prove that.
Happy to be told I’m wrong, but that’s how I read it.
Very little if anything is ever proven to be absolutely true in all circumstances. The author did a decent job of controlling variables and blinding so their evidence for a lack of effect is substantially more robust than any number of personal anecdotes claiming an effect.
We’ve known for centuries now that people are absolutely terrible at knowing if medical interventions work beyond placebo unless you use rigorous protocols to remove bias and account for reversion to the mean. Yet it seems the message just doesn’t get through to vast swathes of otherwise intelligent people.
Happy to be told I’m wrong, but that’s how I read it.