Fake trader? I don't think so because he proved in the past that he can make money as he earned that $100M through trading. It's just that market makers targeted him and since there's a tracker for whales that are trading in Hyperliquid, they can easily counter-trade to him just to make him liquidated.

Scammer? Did he scam somebody? Let's not forget that the definition of scam based on a quick google search is "deceptive scheme where someone tries to trick you into giving them money, valuables, or personal information". Did he trick you to give money to him? No. He asked through a donation yes, but for me, it isn't a scam because we have a choice not to give him because we will not benefit from it. I don't see any scamming attempt here so it's irrelevant to say at least.
Yes, he knows what he's doing at least in my opinion. Like what I said, he's just being targeted by these market makers and let's also include those retail average traders that are also countering his trade positions since they can track his trades on Hyperliquid.
Good for him. I might also try to counter-trade him if there's an update on X where he opened a trade. Ride the wave like what they're saying.