dshizzle [1] filed a deletion request for metis-64 [2]:

Please remove the package metis-64 since I renamed it to metis-i8r8. This naming convention is typically used in high performance supercomputer libraries and may be more familiar to users. This name also allows to add metis-i4r8 and metis-i8r4 packages without ambiguity.

[1] https://aur.archlinux.org/account/dshizzle/ [2] https://aur.archlinux.org/pkgbase/metis-64/