Their O-A advice is wrong. Bank funds are in home country bank. The income letter doesn't require an affidavit. Also METV need a reentry permit during the final extension. I didn't read the whole thing. There may be more errors.
At Hua Hin they are not too fussy about tm28 reporting. I did one when I returned from Australia to my condo room and they said don't worry about it next time unless your address in Hua Hin changes.