You can see from the version history in the first post that at the end of May last year the plugin was changed to use some new PDF libraries that calibre uses. Amongst these changes is that it no longer attempts to estimate the page count for a PDF as a result of converting it to text, instead it uses the actual PDF metadata. So you should get the exact same number of pages appearing for a PDF as if you open it up in Adobe Reader or Foxit for instance.
The numbers you get from the plugin now should be the accurate ones representing PDF pages, not a page count based on how much text was on a "page" like it used to do previously.
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