grazzolini [1] filed a deletion request for dropbear_initrd_encrypt [2]: This package was split into other 3 packages: mkinitcpio-netconf, mkinitcpio-dropbear and mkinitcpio-utils. The relevant information on wiki has been updated to reflect this change a while back.
[1] https://aur.archlinux.org/account/grazzolini/ [2] https://aur.archlinux.org/pkgbase/dropbear_initrd_encrypt/
