That's not correct. If Seattle wins, Minn wins, and either New Orleans or Carolina wins (they're playing each other), then StL is out (having lost to both NO and Car).
However, what's important is if the Rams win tomorrow, there is no scenario where they would be eliminated before next week. They would still be "fighting for their playoff lives" against the Jets.
But, on the other hand, if StL loses tomorrow, they're eliminated.
So tomorrow's game is big, big, big!