Why doesn't Sadhguru teach us how to do Mahasamadhi?

All this talk about mahasamadhi and how we should seek Mukti.
But he really just teaches us to alternate breathe through our nostrils and sit still.

WHEN CAN I LEAVE THIS PLANET ALREADY.
I don't want to be here. I don't want to get old.
I want to leave while I'm healthy. I seen enough of life.

This repetitive shit, this mundane life. I am DONE.
But I don't know how to escape.