where is my comment? Fingerprint matching is a pseudoscience. That’s a fact. Do you really think there is some computer program out that automatically compares billions of fingerprints or compares your face to billions of other photos? Even if there was there would be unacceptably high false positives. It would be useless (and require a lot of computing power, servers, expense, etc). Notice nobody ever gets randomly accused of being someone else? That’s what should be happening of such a system was actually being used.
It’s one thing to police these forums for misinformation about visas, but it’s another entirely to push myths about biometrics, forensics and computing.
I cannot fathom why they would ask for a residency certificate for a retirement visa issued outside Thailand since conceivably you might have never even been to Thailand.
Also, what does retiring have to do with renting an apartment long term? Do they think that retirement = stay in one place and wait to die?
Get your guesthouse or hotel to print out your TM30 and bring it to immigration. You can do your 90 day report but the online system is probably too finicky to accept it if you were doing it in Phuket.
the “20k in cash” is a requirement for visa exempt entry, not entry with a valid tourist visa. An immigration officer could ask for it but it would have nothing to do with actual requirements. They know you have to show money to get a tourist visa in the first place.
There should be a "valid until" date (or something like that) on your re-entry permit. That is the date that your entry stamps expire whenever you use the permit to re-enter the country (I am assuming it is a multiple entry permit).
If the valid until date is February 20th, that does mean the officer made an error when they stamped you in. If that's the case, I'm not sure what you should do about that. Being Thailand, if there is a problem, you will be blamed.