Well in normal times/pre-covid, they’ve fenced off a spot on the main beach area in front of the Lava Pool - roughly between the boat dock and first bungalow - and it’s Poly guests only in that area. Non-Poly guests could go anywhere else on the grounds.
Without normal 7/4 fireworks, I’m going to guess (key word) they won’t be doing any sort of fencing off/restricting of access. I guess the only question is if they think HEA on 7/4 will generate enough non-guest holiday traffic they feel the need to do something. BUT, with the hotel side still closed and likely limited resources, I’m going to assume no restrictions.
Caveat that this is just my speculation!
Having been there for a few 7/4s and NYEs, most Poly CMs don’t even know the plan until that day/evening. Holiday setups traditionally haven’t been something particularly well communicated/posted in advance.