I think most young people don't even know what a "hidden track" is....
On a CD a hidden track is a trock that is not in the track list and starts several minutes after the last song.
But even on CDs that was a joke the last couple of years because when you ripped a CD onto you PC the Media Player would show the last song's length as, for example, 25:00 minutes....so it didn't really come as a surprise that there is another track after the last regular song ended...^^