Apparently not, but I only just noticed after their free 1 year trial of SSL certs expired. They're listed on the Let's Encrypt site as having no plans to support and the source is pretty hilarious:

https://community.letsencrypt.org/t/web-hosting-who-support-...

Yes, you can set it up manually, but you have to do it every 90 days as opposed to having it automatically updated in a supported hoster.