UPDATE 2020-10-16: This is now fixed.
We are aware that, as of this writing, our website is not 100% https. Our website is hosted by Canonical. There is an open ticket to get everything changed-over, but these things take time. There is nothing the Ubuntu Studio Team can do to speed this along or fix it ourselves. If you explicitly type-in https:// to your web browser, you should get the secure SSL version of our site.
Our download links, merchandise stores, and donation links are unaffected by this as they are hosted elsewhere.
We thank you for your understanding.