Comment by ratrocket
Not the person you're replying to, but when they said "extraction" I believe they're talking about extracting pages from a PDF (like "splitting" the PDF apart, page-wise), not text. At least that's a thing I've used qpdf for in the past.
Which is also what the "extract" button does in Adobe Acrobat Pro DC for Professional Enterprise Customers or whatever they're calling it now, so it's arguably a term of art for PDFs.