Why do you say that?
In this case, first the FAQ gave me those vibes. Why? Hard to tell. If I have to force myself explain it, it has the kind of didactic and dumbed down tone that I usually get from chatgpt when I ask questions about complex topics.
Then I went to your blog and saw the entries were mostly (I assume) AI generated as well. I know it doesn't necessarily follow that because of that this website has been mostly created by ChatGPT as well. But I saw it as some kind of weak confirmation.
Finally some of the JS code comments such as "Plot Charts" right before a "PlotChart" also made me think this.
As I said, I'm just extra cautious about this stuff lately. You are the creator, you know how you did it. If my intuition was wrong I wholeheartedly apologize for making that statement. I could probably have expressed it in a kinder way. I know that it's not easy to create it something now and put it out there for people to see it and criticize it.