As I don't have any "money in the bank" guarantees, all of this stuff tells me not to trust anything electronic, and that I will just present myself, with wife, at the Surin Immigration Office with a bagful of paperwork, and evidence, and completed forms, and some photographs, and some money, whether it be for my 1-year retirement extension or 90 days.
The 1-year one comes before 90 days so I assume that, like last time, the 90 days timing starts again from the extension date. Or maybe that was non-standard.
Or, much more likely, it will depend on the attitude of whoever is dealing with it.