With a surprisingly simple update (https://git.sr.ht/~alanz/guix-channel-az/commit/59259823a5d717ee7e80295a979a3036722801e4), my #guix packaging of erlang-language-platform is updated to today's version, which no longer gives a bogus "Eqwalizer disappeard" error.

Channel is at https://git.sr.ht/~alanz/guix-channel-az