180 days, the length of DTV stay does not even make you tax resident. As far as I know immigration also does not ask to show Thai tax payment records for other long term visa, simply because there is no relation between visa and tax.
the difference is that the people living 50 year in a country take the holiday outside the country voluntary, they can stay 50 years if they want. The DTV holder is forced to leave the country after 360 days.
not childish and not downgrading. It is quite obvious the DTV is not meant to stay for 5 years in the country. When that really was the intention, they would have made stays longer than 180 days, for example 1 year, and give the possibility to extend in the country with a year as often as you want. That you currently can almost stay 5 years in a row, does not change that fact.
said is far too generic, but the first part is describing the general rules without mentioning DTA which has impact. So in my opinion it is not BS, but just incomplete. To be complete is almost impossible because every DTA is different.
Do you really think Thai tax office believe a farang lives from 9000 baht a month? Even the average Thai uses more. There is a reason they want non-o retirement have income of 800K a year. So when someone claims to spend less than half of this, it looks suspicious.