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I see. This site should clear things up: https://www.filmratings.com/ratings-guide/

If a movie still feels like its PG rating should be G then maybe it’s just because of a minor detail (as viewed from a normal adult’s perspective who isn’t super sensitized in that matter) that changed it to be PG. I bet a lot of studios aim for a G rating but fail because of some scenes. That would mean that many movies (PG and G) feel like they are aimed at roughly the same age group but some fail to cut a scene where, let’s say a panda is taking a shower. The rating team says it’s depicting nudity, even though a panda naturally doesn’t wear clothes. It gets rated PG and feels like a G otherwise.

Something like that with a bit more back and forth between the raters and the studios, I guess.

“All ages admitted. Nothing that would offend parents for viewing by children.” for G

vs

“Some material may not be suitable for children. Parents urged to give “parental guidance”. May contain some material parents might not like for their young children.” for PG

“General Audiences” and “Parental Guidance”

So the Tweet isn’t correct.