zsh scp completion of remote files doesn't work when running SSHHelper

Running [SSHelper](https://arachnoid.com/android/SSHelper/) is a great way to access files on your phone. But completion of remote files (scp and rsync) using zsh doesn't work though. While using sshfs is a workaround but sometimes you just want to pull/push a quick file, it's not really satisfying. Where lies the culprit, and how can I get file completion working properly via zsh?