That is a magnificent discovery! It works perfectly for me on UK Sky Go. And also works on UK Now TV app (also from Sky) which has more recently incorporated the same Magisk detection functionality. Note that 'detatched process' flag - that is the way it detected Magisk - seeGuys, i finally found a method that should work for all. It is pretty simple, so let me know if this actually works for you too.
1) Root your phone with Magisk (of course).
2) Install F-Droid and download and install the app called "App Manager" (God bless its dev!).
3)Open the App Manager, click on $kygo and navigate to the "Services" tab. Here you have to block the service highlited in the screenshot below (simply click on the crossed out circle icon) and apply the rules from the 3 dots menu on the upper right corner. You may want to block trackers, receivers and ads services as well (i did it), but that is not necessary and can lead to crash and app malfunction.
View attachment 5254911