You never lived in Louisiana, right? The NOLA accents in movies/TV are always cringey, IMO. I would say for where Landry grew up, that's probably a common accent. You hear them in NOLA but not a lot. You start hearing them more often in Baton Rouge and continuing on down that way. So, IMO, most often when you hear an actor doing a "New Orleans" accent, it's really trying to do a Cajun accent ... badly.