"how did so many people into yoga turn to conspiracy over lockdown?" well its pretty much the above.
I grew up with a chronic autoimmune condition while training and working in the arts and it has always been wall to wall people believing in more woo-type things that are absolutely one step over from concepts of blood purity.
Everything is a toxin, allergy, and negative energy. It's not your white blood cells causing inflammation, its that you're not eating enough organic chia seeds.