Yes. I wasn’t aware of the “attending Texas public schools” criterion, but that would make sense, since they probably would have no other verifiable documentation.
It is my understanding the premise behind allowing them to pay in state tuition was due to them being brought here as children with no ability to do it “right” and attending Texas schools for years. The thinking was these kids would have a better life than their parents due to education but with illegals as parents they couldn’t afford college at out of state rates