I have nothing specific and I’m certain you know much more about natural treatments than I do, but here’s what I know about black seed oil.
It’s from the quinone family and has properties that make it best known as an anti-inflammatory, antioxidant, antihistaminic, immune-modulator, antimicrobial and analgesic. Good doctors have recommended common drugs for use against covid, such as anti-histamines, aspirin, prednisone and iodine, most of those available OTC. If black seed oil has the ability to work in similar fashion to all of these drugs, I can understand why it might be recommended as a treatment for covid.
I know much less than you about black seeds oil (I know nothing..).
Thanks for this info. Saving.