You're making the same mistake if you think that's "incorrect information", because it isn't --- there is a clear and logical reason why the sizes are reported the way they are, and if you'd only take some effort to learn instead of complaining because they don't fit your incorrect assumptions, you'd understand.

A sanity check would at least have the Finder report nothing instead of incorrect information.

You're saying to just not show any size at all if the filesystem contains more data than its capacity, which is basically going to be 100% of the time after enough backups are made? WTF. That makes even less sense.

I'm not one to trust AI much at all, but I bet even an LLM these days would know and tell you why the total size of all the files on a filesystem can appear to exceed the capacity of the storage device.