I haven't lived in Thailand nearly as long as you. The youtube video is 1 year old which means those MyGov questions are not new. To be honest, I'm a bit worried to open MyGov because maybe if I do the 28 days starts because I have been served. I don't care much about the mailing of the paper. I would sent it by courier.
You have to tell them a date of return and how long you will be away for. I have no plans to go back for at least the next 12 or 18 months, maybe longer. If I say that then I will have to pay that tax for sure. If I tell a porkie and say 6 months then they might send me another one in 6 months and what do I say then?
Why did this guy get it and others not?