Yes, LSD would have been easy to obtain for people in the mental health field, and that was around the time The Beatles went to India and there was a lot of interest in Eastern philosophy.

The video in the OP would best describe the course as Monism, the belief that God is in everything.

There are some good ideas about forgiveness in the course, but the whole channeling concept makes me think it is a lie wrapped in truth to get people to look for God in themselves and muddy the spiritual waters.