Think that over - states have no standing in enforcing the terms of their joining the union? On the other hand states are allowed, and even forced (by threatening to cut federal funds), to enforce federal laws and edicts, such as drinking age [1], transgender bathroom access [2], or not hiring enough minority-owned tunneling companies [3].
Only when it comes to enforcing federal laws that the federal government would rather not see enforced, do suddenly issues of standing and federal jurisdiction appear - as if states have no interest in who enters their territory.
States and their populations direct how the federal government should act by passing laws. That government then ignores those laws at their leisure, and prevents the states from enforcing them. Doesn't that sound a bit undemocratic to you? Though that accusation seems to be levied only when convenient, with little relation to its meaning.
[1] https://www.theatlantic.com/politics/archive/2014/07/four-ti...
[2] https://www.foxnews.com/politics/biden-admin-holding-school-...
[3] https://www.kiro7.com/news/federal-government-threatens-pull...