Hey
@Br***
, welcome to the group.
Some of the requirements get repetitive sometimes as they add them to the list or try and cover multiple types of applicants (like non UK residents applying in the UK).
Your passport is sufficient to show residency. As for the financial l, I don't believe the Non-B requires a bank statement. Your letter from your employer should state your salary which should be sufficient, however I'd probably submit a print out of your bank statement showing at least 20k baht ($800 usd) to be safe as that's the requirement for a tourist.
Please let us know how it goes, I'm curious how they'll handel new visas during this time. Good luck!