Reference of "in part based on"

Do you think "in part based on" in the following text refer to "has argued" or "to be found"?

Text:

Kaja Silverman has argued for the anti-patriarchal and liberating aspect of “deviant” male sexuality that is to be found in Fassbinder’s films, in part based on the masochism that is the basic driving force of human interaction
within them.