you know what I meant

Nope. Influenza and covid are virus-caused respiratory conditions. I failed to grasp your point.

Which one?

You'll have to read the link you supplied.

as many studies as possible.

I suppose you're right. At least that one found no evidence of harm. Still seems odd to me that they would include it: they seem to be saying "Try this. It didn't do much good but it doesn't appear to hurt."