I have never heard of Rudolf Steiner. When I read your post, I thought, “What an evil SOB…who is this guy?!” So I’ve looked him up and now I have to pursue this with more investigation. He had the belief that fallen angels of darkness began to inhabit the world after 1879… and in the quote you posted, he was saying that these fallen spirits that were inhabiting humans would use “medicine,” vaccination in particular, to prevent mankind from ever being able to access the soul or connect with God. He was definitely not saying this was a good thing.
I found it interesting because it seems to align with the Book of Enoch; although these dark spirits have been walking the earth long before 1879. You have to admit though…he was dead-on accurate with what they have been doing since the late 1800s.