There has been a secessionist minority in Texas basically since it joined the union. Conservative lawmakers have long played into the idea of Texan independence because it’s popular among constituents, but again, there is no real substance to it. It doesn’t have any more teeth than other deluded chauvinist movements that believe America can win any war. “We’ll show them why we don’t have healthcare” etc. There is no actual ability for the right wing nuts in Texas to actually divorce from the federal government. At most they will continue to perform stunts like the barbed wire fiasco under Biden that you alluded to.

Texas is critical to the US national defense and military strategy, so it will never be allowed to happen. Texan elites also recognize correctly that they depend on the power of the US economically and military. While not exactly unviable on its own (I think Texas is well positioned geographically) the calculation just doesn’t work out in favor of secession.

However I will concede that it would be funny if Texas seceded, so I’m not gonna argue against the idea too much harder