That's another clique thing. People have a strong aversion to amateur body language interpretation. It doesn't go down well on here. Not even joking.
It's a common way of people seeing whatever they want through cognitive bias. Particularly used to "prove" a player is unhappy, leaving, or whatever else suits someones pre-existing belief. Some people believe you can spot liars based on simple things, despite science repeatedly demonstrating the opposite.
Your comment does explain why there weren't more comments in reply though! Seems a bit strange that certain made up stuff is frowned upon when much of the discussion on here is driven by paper talk and random beliefs in various things that lack evidence.