I don't think his point is about sadness.
I think his point is that people have compulsive habits like smart phone use, overating, drinking, surfing the net, bickering on the net, etc, because they are terrified being alone with themselves and whatever comes up.
In other words, exactly what the dhamma asks us to do. Be alone with ourselves, with whatever comes up, without running away.
I can't think of a video more appropriate for this board, thanks for starting this thread.
In reading the scriptures, there are two kinds of mistakes:
One mistake is to cling to the literal text and miss the inner principles.
The second mistake is to recognize the principles but not apply them to your own mind, so that you waste time and just make them into causes of entanglement.