He has a right to call it as he sees it. If the manufacturer doesn't like that they shouldn't have taken the chance of giving them to him for review.
ZMF vs Super Review*
https://www.headphonesty.com/2025/01/audiophile-defends-negative-headphone-review-zmf-claims/
I'm on team Super Review* here. I think Zach may have handled it wrong or could've reached out privately, first, at least.