Possibly it's the author removing them at the first one star rating to keep their author score high?

>shows only 3 books now

Those appear to be by different authors with similar names: https://www.amazon.com/s?k=%22tom+lesley%22

Amazon has no reason to give a shit about piracy on KDP: they make money either way. But having a load of AI generated garbage on your platform makes it far less valuable. You want your stolen books to actually be good. :P