Site almost ready to launch displaying when I enter link in Facebook post

When I enter https://www.sonicasylum.net as a link in a facebook post or a comment, the image which renders shows the ‘Almost ready to launch page’ with the rocket. Why is this so? I have disabled the plugin, deleted the plugin and I have set the site to be indexed by search engines. I’m baffled. Any clue what’s wrong?

The page I need help with: [log in to see the link]