That is absolutely not true.
HSBC admittedly will be the hardest, and will not open account on the spot, but you will not be refused immediately or fed some bs like "we only open accounts for permanent HK id holders".
Having statement from a different bank showing you have over 100k usd in cash/investment will be of great help.
Again, with all that said, Bank of China is currently the easiest one for non-HK residents.