Nothing you said holds any water.
Based on our previously dealings, I knew there is an issue with PayPal and Taiwan.
https://www.paypal.com/tw/webapps/mpp/system-enhancement-faq?locale.x=en_TWSince September 15, 2015, Taiwanese citizens can have a PayPal account in order to take international payments, BUT they can't use its balance to trade with people inside the country. So this presented a problem for OP. Buyers typically either want escrow or PayPal for protection, but he can't do escrow because he doesn't have capital, so that leaves PayPal. Distributors within Taiwan want cash. So how can he go from PayPal to TWD? He can't trade it for cash with anyone inside the country. But the other bigger problem is that PayPal will often hold the money Taiwanese receive seemingly at random for 10+ days, and from my experience attempting to use PayPal with OP, at a much higher percentage likelihood than citizens of other countries. (Although, admiteddly, that could be sample size n=1 issue.)
What does that have to do with anything? I know many in Taiwan who use paypal, withdraw to their bank account, and get cash no problem. If OP has a problem then it's because paypal's algorithm suspects him of being a scammer and will hold the money.
So by acting as a non-stocking retailer, I could take the payment as PayPal and send it to him in some other way. The end goal was to do a few orders this way to see how things went, then switch to a more traditional importer approach in which I'd buy inventory and sell from the US.
Scammers use other people's account to do their dirty work. The fact he's used your account instead of his own should have raised a big red flag.
In Taiwan, it seems to be, that businesses will sometimes give you a discount if you choose not to get a receipt, essentially helping them dodge sales tax. They've attempted to fight this problem by turning receipts into lottery tickets, but OP is obliging his suppliers by not taking the receipts.
Again, what does that have to do with anything? Because other people are disobeying the law, he helps them with it? Everybody knows when dealing with online shipping and such, people want receipt, tracking, and any other info. Nothing but poor excuses.
According to him, he feels that his limited English is not helping with making people feel more safe about this transaction, and instead, simply adds fuel to making them distrust him more. And he feels like the proof will be when packages arrive in the mail and everyone is happy from his actions and not his words.
BULLSHIT!! Read any of his post and you'll see there's no problem with English. His upwork profile even had him as 1st in the English test while many other top translators are around the 95% range.
He's working the same scam he did on upwork before he got banned for scamming. Full fill small orders to seem legit, than run away with the big orders.