No, that’s not true.
The Art I section has nothing to say about that and the Art IV section SPECIFIES which situations the Congress is given power to control. Succession is NOT one of the situations enumerated in Art IV.
Your statement, “once allowed to join Congressional approval is needed for any change in their status” is not true. Only the specified situations trigger empowerment.
Amendment X tells Congress that if a power is not delegated to it by the Constitution, it ain’t a Congressional power.
By implication it is.
Your statement, “once allowed to join Congressional approval is needed for any change in their status” is not true. Only the specified situations trigger empowerment.
Joining to begin with, changing borders, splitting up, combining with another state are all listed. Again, it permission is needed to join or change, why shouldn't it be needed to leave?
Amendment X tells Congress that if a power is not delegated to it by the Constitution, it ain’t a Congressional power.
And the Constitution clearly states that the power to admit a state and approve changes in status once it's been allowed to join is a power delegated to Congress.