And the ruling doesn't even say what he claims. Just says Texas can't pull a Brexit and has to deal with Congress 1st.
Unilaterally. If A state petitioned Congress to leave and got 50%+1 say yes, they'd be out. Just like anyone that wants to join. By your logic States can't join and we should still be at 13.
But that's not the same as states can't leave. States can leave, they just can't walk out on everyone else without warning.
Because you don't want a Brexit situation. lol But there are no laws saying a negotiated exit isn't allowed.