Because when they get a trade wrong, it's never because of their model! It's always because of something else!
FTA:
But that means sometimes there’s a lag between what the numbers are and what they should be, had they been updated sooner. A young prospect with helium may be traded in December, let’s say, and the trade might look a little off because our numbers are still reflecting the previous update on a prospect (or two) that was involved in it. But then, the new numbers might come out in January, and at that point the trade looks a lot closer. In other words, the gap was caused by a time lag, not an issue with our model.
Enjoy playing with their toy. Just don't give it more credence than Old Red yammering at the dive bar down the street.