I don’t agree. Watching tv and browsing social media just temporarily heightens the mood, but then tampers of very quickly. That time could be spend doing something useful like following a hobby, because that increases overall happiness.
(I myself do not watch tv but I also have no desire to presume anything of people who do. I at least personally acutely feel a loss of culture because TV and movie watching is very common in socialization rituals and I am unable to engage in them.)
I am not saying you are wrong, or he is, but the ancientness of the claim is not an argument in favor or against it
The neural mechanisms have a lot in common. Video games, I would note, also share that mechanism.