Registered on the new site provided by the US embassy on the 2nd, received email and sms on the 3rd for appointment on the 4th. Rolled up to the BangSue CVC at 3:45 for my 4:00 appointment. No lines. Straight to the forms and BP area (8-10 people-all Thai), straight to the passport check/computer input area (2 people-all Thai), straight to the shot area (50% of the chairs were empty), straight to the 30 minute observation area (60-70% empty), out the door and headed for the bus by 4:25. (was still the only foreigner in sight)
Never had to show the email or the sms and wasn't even asked to pull my mask down when entering my passport info. There were some 8-10 shuttle buses lined up out front and smiling soldiers and policemen at the entrance waving us inside to the a/c.
Was given a return appointment date of 27 October. I'm still preregistered and prepaid at the BangPo hospital for 2 rounds of Modera that is supposed to be here in Oct so it's a race to the booster.