UPDATE
I ended up fixing the segmentation fault, it ended up being the result of version confilcts with certbot-nginx installed via pip3.
I uninstalled all certbot pip versions (as they were version 1.0, and my distro PPA version is still on 0.31)
sudo -H python3 -m pip uninstall certbot-nginx
The post that helped was My certbot got broken (error of version conflict)