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Hi,
I am sorry to inform you but you are mistaken: please note that there is no pagination in the file and that part of the text on one page is broken off onto another page. This means that the file is a conversion from .epub (or similar) to pdf. The file available in sanet.st is the same available in libgen and Z-lib. The original TruePDF file has 976 pages (Cf. [Login to see the link]) and the converted .epub (Reflowable) has 1657 pages.
P.S. Reflowable = Reflowable eTextbooks do not maintain the layout of a traditional bound book. Reflowable eTextbooks work well on any device and respond to your device size much like a typical website. Reflowable eTextbooks may also contain embedded audio, video, or interactive components in addition to Bookshelf's standard study tools. These books conform to EPUB industry standards. Reflowable eTextbooks support a wide range of features, including (but not limited to): notes, highlights, text-to-speech, printing, syncing across devices, and more (Cf. [Login to see the link]) .
I checked the link and karolus gave the right explanation