I don't know about all that. It's not like shooting in the dark at ISO 32000. It's a sunny day that you've stopped the aperture down a couple of stops. Which means you're probably already shooting at low ISO100. Cameras can easily push to ISO800 with no noise being introduced. Newer sensors can easily go higher than that. Hell, my BMD camera's base ISO is 1600.

So I'm just going to come out and say claiming that pushing the ISO and introducing noise during a daytime (albeit cloudy) shoot and pushing the ISO a few stops to counter stopping down is fake news and scaremongering.