Join these groups and search for "Los Angeles" or "LAX" and you'll see tons of posts of the clinics for both the test and the fit-to-fly with lots of helpful details about price, turnaround time, and any issues: 🇹🇠Farangs Stranded Abroad Due to lockdown in Thailand and Thai Expats Stranded Overseas due to COVID-19 Restrictions. It seems most people are recommending Genix, MyConciergeMD and Passport Health. Also join ASQ Hotel Review if you're trying to decide on the ASQ hotel.
Join this group which is the hub of info about who is getting approved for COE and issues faced: Thai Expats Stranded Overseas due to COVID-19 Restrictions
Nathan Aiyna Sassen ATMs are only in the domestic terminal for arrivals. None before immigration for international arrivals so you can't withdraw cash to show to immigration if required. And when you depart from Thailand, once you pass immigration, in the international departures terminal, the ATMs will only dispense foreign currency. They don't dispense baht since they don't want you taking too much baht out of Thailand.
that's completely wrong as many have posted hundreds of times. It must be cash only. Not bank statements, credit cards, etc. People who try that keep reporting immigration rejects anything other than cash but the cash can be any major currency equivalent to
You keep saying Singapore has unlimited entries to Thailand. So do all the other visa exempt nations/regions like USA, UK, Hong Kong and plenty of others to come to Thailand. Please read the many, many threads in this forum about others being rejected who technically meet all the requirements for entry. It is up to the immigration officer whether they choose to allow you in. It has nothing to do with whether you have a visa from a consulate or are entering visa exempt. It happens all the time. You unfortunately have a lack of understanding of how it works and are trying to argue "by the book" with the rules, which clearly isn't the case for how things work if you read all the posts from people who had similar problems entering the country.
You may have made the same mistake I did the first time I did it: after entering all the people you intend to submit, you need to hit the save button which is on the top right of the web page so that your records for that day are submitted. Until you do, they are not actually sent to immigration.