I would never see it as a replacement, but if you are having a lot of fun with it, why does it matter? Do what brings you joy.
The social aspect for me is WAY too big a part of RPGs in general. LLMs don’t fulfill that at all for me. It is just a robot that knows what words goes in what order, there is no back an forth or creative creation between people with different life experiences or ideas of what “cool” or “interesting” is. Getting to chat with my friends and share in their creative space is so awesome. I am an online only player these days because it is the only way I can find time and connect with friends across borders - I don’t feel online detracts from the experience, sure it is different than in person, but once you have a good group it’s just a good time with friends.
Personally I have used LLMs as part of my GM prep. Mostly just to fill in things I don’t really care about (like a minor detail of colours of unimportant objects a module left out) or to bounce ideas off, and to do a BUNCH of text formatting for me. It is a great tool to kickstart the process but I find I always have to sit down and actually do the work myself in the end.
I can see how being alone in a new place where you don’t speak the language can very easily lead to an over reliance on good LLMs to take up some of that social space you might be used to. ChatGPT is an amazing thing, but we need to be aware for how and why we use it. Our monkey brains are easy to trick.
In my experience my players are excited about the rules and how their characters work - but not all of them learn well from “just reading the rules”, like it literally does not stick. Just telling them to read the rules isn’t going to do anything but make them feel shitty about the game.
Talk to your players about how to help them remember or have easy access to these rules. Make sure you don’t get too accusatory, you do want to play with these people after all.