Yes its true, all of it. It was very sad.
Strap pads onto the guy and give him a bat, any old bat would do, and the guy would produce incandescent cricket. Take him off the field and he would talk like a madman. He slowly went from bad to worse.
He was selected for the Delhi Ranji squad and at the nets at Feroze Shah Kotla, Ram Babu Gupta, who was the manager of the Delhi team (and of the Delhi University team where Prithvi was a star) and an umpire of those days asked him to fetch him a box of new balls from the pavillion. Prithvi turned around and told Ram Babu, ' If you think that you will include me in your Ranji team and in turn I will run your errands like a servant, you have another think coming". That was the last time anyone considered him for the Delhi side.
I asked him later why he did this since everyone in Delhi cricket was talking about it. He was adament that Ram Babu wanted to humiliate him since he had slaughtered the team Ram Babu was associated with and had refused an offer to play for them. So Gupta was trying to show Prithvi who was the boss.
He used to just imagine such insults aimed at him by one and all.
He was also an extremely well read guy and could quote extensively from English literature. He wrote beautifully and had hand writing as if it was printed. It was like calligraphy. He could also bowl medium paced outswingers and in-cutters.
Tall and athletic he was a natural.
My one regret in life is meeting Prithvi when I was still young and did not understand what was happening very well. Psychiatrists were not a common thing in the Delhi of the 1970's. Lunatic asylums were. I am sure treated early, Prithvi had a great chance in life but no one tried to give him that chance and he slowly slipped into the abyss.