A DTV visa does allow it and is a proper visa. There are no unproper visa, unless you count the ones via agents which f ake your requirements as fulfilled.
There is nothing "strict" about asking extra stuff that is not required by the rules. E.g. having been in Thailand before for 180 days and proof of that.
It was probably in a different group, but I saw it as well. Not sure, but I think I saw two posts from two different people at different locations in Thailand.
I guess most hobbyist visa experts never will graps the small differences of English language terminology applied to "staying in Thailand" - I wonder how they can do their "remote jobs" successfully? I mean if I would make the same mistakes about something as simple as this in my computer science jobs: I would be instantly out of my job.