We’ve addressed the “TV Practice” concept in another thread, but my best guess is this a way of generating randomized movements that feel natural, in an attempt to try and figure out picking mechanics by feel, i.e. without teaching.
The old practice advice of endless “correct” repetition fails when the movement you’re endlessly repeating isn’t actually as correct as you think. For example, repeating hours of stringhopping isn’t going to do anything but injure you.
Instead, the “randomized” approach is a way around that by turning off your brain and doing whatever feels easiest / most natural. If there is some connection with “playing softly”, it’s probably because your playing technique feels more natural when you’re not killing the strings.
Keep in mind that this concept is a method for learning a new movement, one you cannot do currently. In other words, it is a motor learning technique. It is not really a technique for athletic training and getting faster. It also works best when you know what movement you’re trying to achieve, and continually evaluate whether the randomized approach is actually producing that movement.
Simply sitting on the couch doing “something”, and hoping that “something” will result is going to have a very low hit rate by itself if you don’t know enough to immediately identify when things are working and pursue those things in more conscious practice.