I sympathize.
Bitmain are an incredible company, an iconic leader in the space, and the founders deserve their plaudits. I posted as much here: Bitmain: selling BTC, accumulating BCH, mega IPO approaching. However, being an Amazon or Goldman Sachs does bring extra scrutiny and criticism – and you are held, at times unfairly, to a higher standard than your competitors.
Personally, I think that miners and manufacturers do not need to disclose any information to the Zcash Foundation. First, if the information cannot be verified, what purpose does it serve? Second, and most importantly, Bitcoin style cryptocurrencies are supposed to be trustless, it’s the very reason why proof-of-work exists.