>>2631928You literally missed the joke.
1. Osakans have many stereotypes. The common ones that are used here are: that they are stupid, loud and obnoxious but often mean well even while being frank. These are all translated perfectly well in the dub by having a southern drawl.
2. Ayuma Kasuga does not sound Osakan.
I need to repeat this as your point falls flat here: she does not sound Osakan.
Tomo even points out plainly that she doesn't speak nor act like how she expected a normal Osakan to sound like. Osaka answers this by saying that she's lived in many places before Osaka, it's just that Osaka is where she lived before the series started, so her accent is a weird unique mix of many.
The dub is a very well done one, and the fact that the two points of discussion (Chiyo and Osaka's voices) are still being argued really baffles me.