He has 100% positive feedback, like emilio2 said it's a "Buy now" item, and your only "proof" of his untrustworthiness is an unknown "group on Reddit".
If his only "crime" is to try and drive the price of his own item up, I don't see a problem. It's up to the buyer to decide the price he/she wants to pay in the true spirit of auctions.
Your only activity on the forum is related to Ebay listings or trying to buy a printer cheaper locally. Since you're so worried about scams I'd just recommend that you buy one from a known re-seller and be done with it.
Many people on eBay auto-bids and thats is not enugh to tell he/she is a scammer. On the artcile you point out the item is a buy-now offser so I cannot see the way to auto-bid. On the other hand he/she has a good feedback selling the same kind of artciles. Cannot see the 'scam' anywhere.
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