I know that because it wasn't a one time incident. We continued to consciously and intentionally consume zinc-rich foods at a greater rate than normal and it successfully alleviated symptoms that had us concerned. It did so consistently for some period of time until those symptoms finally resolved. We pay very close attention to our diets because of the medical situation. So I know we were consuming abnormally high levels of zinc for some weeks.
Your framing seems to suggest you think I am saying zinc helped "cure" us of the infection. That's not what I'm saying. I'm saying it helped mitigate the worst of our symptoms, which is a completely different claim.
You are correct that I don't know for absolute certain that we had Covid-19 because that was never verified by testing. I've already made that clear and also made it clear that I'm not suggesting treatment to anyone else.
I'm aware there are people promoting zinc as a means to cure Covid-19. I'm not remotely suggesting that.
Even if you accept that I'm correct about having it and I'm correct about zinc helping us, the only takeaway here is that zinc may mitigate some symptoms in some populations, especially populations prone to nutrient deficiencies.
If you have any reason to believe you are zinc deficient, zinc is a good thing to take to treat your deficiency. If you aren't deficient, I'm not recommending it for any purpose.
This is a consistent stance of mine and has been for many years: It's a good thing to determine if you have deficiencies and redress those deficiencies. Otherwise, I absolutely don't recommend any kind of supplement at all. I think it's a dangerous practice to take supplements if you aren't deficient.