With respect to sideloaded books, the number of read books in the stats is the number of sideloaded books on the device that are in the "Finished" state. So, if you delete a finished book from the device, then your read count will drop.
For purchased books, it is different. If you remove the book (status shows as "Download") it is still counted. That is to do with the details of the books still being in the database. If you finish it on another device or app, I do not believe it will be included counted on all of them. I haven't played with this enough to be sure what happens.
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