Parasites seem to reduce mortality associated with Covid, and Africa has a high parasite burden. More research is needed, but this is a reasonably sized study (751 patients):
It's a cool idea, but without specific examples, it's hard to evaluate the validity of it. And without them, it's guilty of doing exactly what it accuses others of doing: polluting the mindscape with ideas that most people find difficult to verify.
Information about toxicity to pets would be useful as well. If you have pets this it's something you should know about, as many common house plants can seriously harm or kill pets if they ingest the leaves, which can happen when you're away from the house, for example.
https://mead.uslakes.info/Level/