I feel that may be a little unfair. Maybe he comes from that subject, maybe that seemed like the best word to describe his effort?
I don't have the feeling that this is a corporation trying to bamboozle us with marketspeak.
He is French from Paris and yes in this context polyvalent === flexible.
That's what I thought. So maybe we need to work on the word flexible, and apply it to his library.
Polyvalent in French rather means someone with multiple competencies, or something which can be used in more than one way.
It might be a language issue. In Portuguese "polivalente" is a very common word meaning something has many functions. Nobody thinks of chemistry upon hearing it.
An English equivalent might be multifunctional then, or flexible, as other comments have suggested.