Yeah, unfortunately you are correct.
Texas needs to erect stuff on Texas State land...
Even that will go through the courts, but it might have a shot
The Texas side of the Rio Grande is Texas soil. If the barrier crosses over into Mexico, then the Mexican government is free to dismantle it as they please. I am unaware of any international seaport on the US side of the Rio Grande.
[[Texas needs to erect stuff on Texas State land...]]
They did and biden ordered it welded open