I'm fairly certain the person you're replying to is prognosticating about the potential sanitization of the next game. I don't think the content of the older games really impacts that.
I think the person you are replying to is pointing out that the content of the older games, for the most part, aged very well and is more relevant than ever. And this wasn't a coincidence, because if you were paying attention 20+ years ago, you saw the future we were building. Rockstar's writers were paying attention. I expect the content of gta6 to be more prescient than ever.