MarsSeed [1] filed a deletion request for lib32-assimp [2]: There is no 32-bit consuming library or binary of this package, and it seems even in 2015 (oldest web.archive.org snapshot) there was none.
I don't think it is useful to keep this. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lib32-assimp/
