I am not familiar with what you’re talking about. It may well could have been presented as a visual novel, but only in the sense that you click through it. My recollection was that it was a corporate training thing (which have similar layouts to visual novels lol). As far as AI generated backgrounds though, I don’t think so. Memories are not reliable, of course, but I’m fairly certain this was pre pandemic. AI images existed then, but it was mostly the dog-filled deep dream images and sketchy dall-e stuff. Maybe it used that, it’s not impossible, but it wasn’t really at the level of quality back then where you’d be tempted to use it over stock images.

I think the program had something to do with fire diamonds, those 45° offset squares with numbers in the top three corners to give a quick overview of dangerous materials are.