Try opening one as a citizen in the UK. I had to jump through hoops to open HSBC in UK and I had an account with them in Singapore. I paid for some expedited process in the end.
Not to worry - it is confusing for many people how this will all work out. It falls between the two extremes of the sky is falling and everyone must pay taxes in Thailand or be shot to the other extreme of nothing will ever happen so ignore everything. I suspect it will be something in between. The new rules regarding remitted earnings into Thailand all being assessable started for 2024. Already, the govt are talking about changing this as less money has been remitted. At the moment, a DTV holder should watch and wait unless it is your home country making you make a decision over Tax Residence.
Probably along the same lines as BOI define it for some of their visas and LTR. They usually use the term "Highly Skilled Professionals" though. "Foreign Talent" term used more in Singapore. This is an immigration document after all.
1) First 90 day in person or recorded post 2) TM30 if travel and return to same address. Some offices require reporting others do not. Check local requirements. When I needed to do it I just filled on form at office myself confirming return to same address. Landlord not needed