Facebook's New Certificate Transparency Monitoring Tool (facebook.com)

I put in ycombinator into the actual tool, and got some very interesting results:

  Domains:
  ycombinator.com
  *.optionking.com
  optionking.com
  *.movie-blog.org
  ssl4679.cloudflare.com
  *.ycombinator.com
  movie-blog.org

  Valid From: Apr 15, 2014 - Oct 22, 2018

Is this just due to shared certs on Cloudflare?