I believe the article shows screenshots of it in Apple TV (at least)
Looks like it uses the method in this article https://developer.apple.com/library/archive/qa/qa1948/_index... but i have not (yet) tried it
Looks like it uses the method in this article https://developer.apple.com/library/archive/qa/qa1948/_index... but i have not (yet) tried it
TL;DR it involves using Apple Configuration to make a custom mobileconfig profile to point to your proxy and then also installing the certificate with the same method.