No it doesn't.
10. (I) No State shall enter into any treaty, alliance, or confederation; grant letters of marque and reprisal; coin money; make anything but gold and silver coin a tender in payment of debts; pass any bill of attainder, or ex post facto law, or law impairing the obligation of contracts; or grant any title of nobility.
https://avalon.law.yale.edu/19th_century/csa_csa.asp#:~:text=10.,grant%20any%20title%20of%20nobility.
Do you ever get tired of posting pure BS?
Any Alliance or Confederation means leaving the Confederacy. Nevertheless, Texas would have CERTAINLY left. Thier is NO WAY that Staye would have stayed in the Confederacy.