@GenesisFritz *************
It's not about 180 days in a row, but in total per year. For example, if I leave after 170 days and re-enter two weeks later and stay for 60 days, I have a total stay of 230 days and am a tax resident.
What you mean is that my stay in relation to the visa is reset when I leave the country. Yes, with the DTV I get a new 180-day entry when I re-enter the country and always start on day 1. However, this only relates to the visa and the length of stay and does not change the usual international classification as a tax resident if you have spent 180 days or more in a calendar year in Thailand.