People working on the attraction you mean? They're hardly going to say anything negative about it if there's any chance it might make its way out onto the internet. There was a lot of praise for Epcot's Luminous prior to opening too.
I'm a so-called "backwards hillbilly" who was born and raised in Tennessee and still occasionally has traces of a deep southern accent and dialect, they should keep the gags. The show was a thousand times tamer at ribbing on hillbillies than even The Beverly Hillbillies and Green Acres. Even the people it gently poked fun at don't consider it to be offensive. In fact, that was one of the largest demographics who enjoyed the original.
The songs they played were not recognizably tied to the modern era in terms of sound or lyrics. That's the thing about country music from the 50s and 60s, the vast majority of it even at the time sounded like it could belong from a much older era.
It's going to be far more difficult to avoid this if they take songs from popular Disney IP. This will scream latter half 1900s (and potentially early 2000s), regardless of it being rearranged with a country sounding twang.
I'm also concerned about the "pop country" part of the PR statement. This presents the danger of potential modern electronic sounding instruments.