Those are US Army soldiers, paid by the US government. Control of the state reserves is only delegated to the Governor, because that makes sense. The individual governors can freely send them to areas which are in need. But the President can take back control at any time. If the governor of Texas decided to take the reserves under his direction and attack the US, they’d be placed right back under US control.
They are not a “Texas” army. They are part of the US Army delegated to Texas.
This is the same guy trying to build some paradise city in another third world country.
This is going to end with him brutally murdered in his huge paradise office by a race of half human, steroid infused crazed people with implants in their head.