Have you noticed that the Casey Burns web site returns a 404-not found message for all the pages?
Yes, the site is down. Still registered until Oct. 2022. Perhaps undergoing maintenance.
If you need to reach Casey, you can email him at caseyburnsflutes at gmail.com & he can call or Skype.
If you just want to review his website, much can still be seen from Dec. 2021 at
https://web.archive.org/web/20211228121917/http://www.caseyburnsflutes.com/
Casey sent me a link to share for those who are interested: