It's a good move, I'd recommend to any person residing in Hong Kong to pick up some of their own BTC and keep it for the future, China wants to control everything and having some BTC in your pocket is a good move and they'd never be able to take that away from you.
in this case, BTCPay is less/not needed
How is it less or not needed? A lot of commercial businesses and non businesses use centralized payment gateways for the sake of convenience. Every payment goes through a filter where these payment gateways analyze the risk of each transaction, even when the nature of the transaction is innocent. The need hasn't ever been more pressing.
BitPay & Co have done nothing but signal the need for alternatives such as BTCPay. The more businesses adapt the more freedom people and businesses will have.
Speaking of such, Namecheap (largest domain registrar in the world) is exploring its routes to ditch BitPay after hundreds of complains of them being shady and because of their unfriendly checkout page. Several users have proposed BTCPay, so we'll see where it ends.
No buisness will accept a decentralized and unstable crypto-currency as a payment option, it's just way too risky on their site. Payment processors are able to provide a way for buisnesses to accept crypto-currencies without the risks.