Top myths in photography

I'd recommend you do some more research as you're very confused. 2 microns is smaller than 8 microns and you're suggesting that it means that smaller sensors don't cause larger amounts of noise, when the 2 micron image clearly has more noise than the 8 micron one does.

What's more, that's just one form of noise that happens. You don't just get to ignore the other forms because they don't permit you to make the argument you want to make.

And what's more, the last column of photos are the result of cleaning up the image after the image has been taken. The noise is still there, it's just that they've blurred over it. The more noise you have to start, the harder the process is.