Not being told that the miner was shipping to someone other than the purchaser can make for a lot of logistical issues with tracking and delivery. This could make dealing with someone "risky".
Think of it as "Drop-shipping" , while it could certainly create some logistical issues, it's not scammy per se, if the deal went smooth and then later on OP found out about his miner being shipped to another person, would he still call Crypto832 a scammer just for that reason? probably no.
Many if not most online resellers conduct business in this manner, as long as the buyer receives their goods as described and the seller gets all the money they asked for , technically there is no reason why the reseller/middleman should be obligated to lay out all the details to both parties, however he must be held responsible if something was to go wrong.
pointing out that he was a middleman without disclosing it in a negative feedback could potentially confuse the reader, IMO any point that does not relate to scam in itself should not be in a negative feedback, for example no point saying "member x is fat and he did not send me 2 btc for my 0.1 btc" , taking out the first part still shows that member x is a scammer, saying he is fat only does not indicate scam, so if the feed back consisted of only the below quoted part
Guy was not honest in his dealings with me - sold the miner forward as a middle man without disclosing
Will you still think it's appropriate? if you answer No, then there really is not reason for it to be there in the first place -
TL;DR given the fact the many members don't really read the reference topic, I think it's always best to keep the feedback as accurate as possible.