Wrong,
Bi polar (manic depression) as been diagnosed for decades. It’s real and its terrifying for those who work and love those who have it.
I was married to one, have a close friend who has the dx and work with them as part of my job.
It’s as real as a heart attack.
So called ‘diagnoses are no more scientific that Satanic possession by Priests, or woodland ghosts by Druids.