The explainer your client was sent assumes a state Louisiana is not
Immigration is federal, and the state law wrapped around it here is genuinely different, which gives a local firm a permanent supply of things worth saying.
Marriage, property between spouses, divorce, custody, guardianship, succession and criminal records are state matters, and Louisiana handles several of them on a civil law footing no other state shares. A national article about a marriage-based case can be sound everywhere else and wrong in Orleans Parish.
So take a widely shared piece of national guidance, say in general terms which part does not hold here, and stop short of advising anyone about their own file. The supply does not run dry, because the national channels keep producing more of it.
It also does something a firm normally has to assert about itself. Showing that local counsel is not a formality is more convincing than saying so, and a correction is the cheapest way to show it.
Keep it general and say that out loud. The line that ends every one of these is that the answer turns on the file, and that it is worth confirming with a lawyer licensed here.