I'm not actually sure where the Petapixel article authors are getting the phrase "100% accuracy", as it does not show up in the article they are writing about, nor does it appear in the only other article they link to. Putting it in quotes makes it seem like a claim the model creators are making about their model, but I don't see them making that claim in general. They say the model matched all the sample data in this case, not that it's 100% accurate—presumably for the same reasons you are hesitant to do so. Unless I'm missing something, Petapixel should correct their headline.