It's mental that he's the coach for tests, odi's and T20's, but also a selector. That has to be exerting far too much stress for one person to deal with, especially in times of a pandemic and restricted movements. The man needs help whether he realises it or not.
I remember the Forged In Fire series, and his idolising of the baggy green. Shane Warne said it was pathetic, Jeff Thomson called it "f***ing embarrassing" and it was revealed that Bill Lawry only wore his when cleaning out his guttering to stop pigeon shit landing on his head!
There was also an anecdote about the 2005 Ashes. Langer led the players to an empty England changing room after the first test at Lord's, sang the Southern Cross, then sprayed beer everywhere.
Adam Gilchrist remembered it and said "We shouldn't be doing this." Then at Edgbaston, little cliques formed in the changing room as England fought back, with the most intense of players sticking together, having not expected the English response that the rest of the team had.
There's no malice meant towards Langer, that much was clear in the documentary as well as the present situation. But an overworked, highly intense, stressed out coach, who has become increasingly defensive and moody, is no good for anyone.
He did a brilliant job in turning around Australia after the fallout from the sandpaper in South Africa. There comes a point, though, where someone has to step in and tell him to let go of the role and keep some sort of legacy intact, before he loses it all, along with his health.