To report on a private source, or not. It all depends on the arrangement up front, imo.
There are definitely VERY private sources that are STRICTLY referral only who demand that they not be mentioned on line. It is part of their agreement upfront with any customer they agree to serve. If the potential new customer does not like, or agree with this before they are allowed to order, then said potential new customer can just agree to shop elsewhere. Under these terms, I believe that it is not only fair, but that if you as a customer agree to this upfront and then go back on your word, you are in the wrong. You broke your word.
There is a pretty well known up and coming pro BB'er that I know of that does this exact thing. He serves a smallish group of clients and because he is his own "brand" he demands extremely limited conversation (ie, absolutely no online forum discussion). He is very upfront about it, he is not a dick about it, it's just part of the agreement of buying from him, and anybody he does biz with has the option of refusing to accept the terms (they don't have to buy from him if they don't like his rules).
All that said, we are wasting our time debating this regarding POTG. He is NOT a private source. He is semi-private. He is on eroids! Him, personally, answers questions and discusses his line. He puts his own brand out there.
As I have stated here at Meso before, I get why guys cringe when they see their goto source mentioned here, especially if it is a private or semi-private source that doesn't operate here. But c'mon guys, POTG has an online presence already and "advertises" on eroids. He counts on positive online exposure as it has helped grow his brand.