While maintainer has modified the package, the deletion request stands. As stated earlier, upstream is unmaintained, and the binaries are not useful on vanilla Arch in current state. Installing the following packages make no difference: extra/noto-fonts-emoji, aur/noto-color-emoji-fontconfig, and aur/ttf-twemoji.
Screenshot attached. [a]: https://github.com/OzymandiasTheGreat/emoji-keyboard [b] https://aur.archlinux.org/pkgbase/emoji-keyboard-appimage/