To add to your excellent point (that there are more democrats in Texas than the entire population of many states), very, very few people are actually a part of this “movement.”
This isn’t a real thing that normal people actually endorse, it’s a bumper sticker you see on an old beat up truck in the wal-mart parking lot.
It’s like the Texas version of flat earthers or ghost/alien hunters or Bigfoot researchers. They do exist but they are massively over-represented in the press because it’s so stupid that people can’t help but “tune in.”