The other forums gave up a long time ago and tressless is a joke. There have been some private forums and discords, but most quickly go the animal farm route.
I would not take anything from that site seriously and always recommend looking at the references.
The author was alluding to this study, which does not show that Zinc makes Minoxidil inactive https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1365-2133.2003.05435.x