Wow, that is impressive! Magic even 
I never imagined to ask about a Library to PDF ability !
The KiCad library area / Librarians really should include this sort of tool, and make use of it to refresh a Lib-Items.PDF on a regular basis.
Can I suggest the heading/index include columns for items count and revision/data and a total count would be good.
The sources of these libs & dates & KiCad release version should ideally be shown in the PDF opening page too, so readers of the PDF know how old it is, and exactly what it applies to.
I can find a nice web file / directory image listing here, for example
https://www.archlinux.org/packages/community/any/kicad-library/files/
but that has libraries not in your PDF ? (most are there)
a couple near the top as examples..
Buttons_Switches_SMD.pretty/
Buttons_Switches_ThroughHole.pretty/
and Capacitors_Elko_ThroughHole is not on that web list, but is found on the web.