Apple Discussions for Homepod and Apple TV Hardware are filling up with complaints about tvOS14 e.g. remote no longer recognised and Homepods not recognised. Fortunately I managed to turn off “automatic updates” on my Apple TV before it installed tvOS.
As I was typing this my ATV asked if I wanted to install the update. I selected “Later”!
BTW - Apple Support is recommending this page for users who are having problems with ATV apps: