I think yeah the language has gotten very ambiguous and the "spectrum" is so wide and ill-defined that we need more and better words, but, I do also feel like it isn't just everyone's shared experience. I do feel like there are a lot of people who don't really experience these things, that aren't stuck in a constant self-conscious hyper-analysis and reflection loop, and are able to just kind of go with the flow a bit more (which is not to say that they don't have troubles or anxieties).
Edit: I will also note that I did have a similar reaction to you to this game. I didn't even go past the intro because I felt like I knew what it was. I would call this something like autism-lite, and it probably is pretty widespread, particularly in HN-like circles. It does feel a little bit confusing and even offensive to compare it to "capital A autism," an actual disability, but that's where our lexicon is right now.