So again, the reason the crew is stuck is that USA don’t allow them offboard.

Yes that seems to be exactly what the article is saying.

But honestly. This is pretty common world wide with shipping issues.

Most nations will only issue a temp visa to crew members. Based on the expected exit date of the ship. And even then only to nationalities with some form of visa agreement.

Most nations are required to meet the laws applied. And when the ship is safe. No emergency law applies. So the only ways a crew could leave. Would be to leave the nation with the ship. As is done in a sinking etc. Or for Congress to pass a law allowing immigration etc to give the passengers visas.