I think negative feedback is too strong if it's based on only this post:
Hi Guys,
Be very careful of a new forum member on here named "YCTMatt". He has photos of some friend he has in China with miners, but is a scam. Several folks have sent him BTC for miners and got nothing in return except for fake tracking numbers. Mods need to do something about this ASAP. He also locks the thread so no one can respond in his thread. Buyer beware guys! Buyer Beware
Neutral feedback should be more than enough to point any potential buyer towards that post, so they can make their own decision. I kinda expect people who pay thousands of dollars for hardware to take their own precautions anyway, and not just trust anything they see online.
Newbie whitepunk has a point about the locked thread though. @YCTMatt: it's better if you unlock your topic, instead of asking people to contact you on (scammer's paradise) Telegram.