The information being spouted on Facebook is from the so-called "tax experts" who are touting for business. Information from the tax department is contained within the tax code and the relevant DTA
Not correct. Retaining Tax Residency in your home country means you do not pay any tax in Thailand provided your "permanent home" is in your home country. Tax credits only work when you have sole Thai residence but earn money in another country. The DTA provides a tie-break formula which decides residency
Not correct. If the OP retains German Tax Residency and meets the criteria in the DTA, there is no requirement to file a tax return. At the very most a tax residency certificate from Germany will suffice
Apparently there were two borders in the Chiang Mai area which were insisting on an overnight stay, I don't know if it's still the case. The two I'm referring are those which generally over the years have been the "friendliest" which is Nong Khai and Chong Mek. In the good old days of the pre-insurance OA visa I used Chong Mek to get the second "free" year, and a drinking buddy of mine from Bangkok used it two weeks ago to "try out" the DTV bounce and it worked no problem with same day bounce. I read a report in another group that someone had done the same at Nong Khai, which is why I mentioned those two. No doubt we'll learn more when many DTVs reach their 180 day limit