Kraków is a low emission zone, not a zero emission zone which is what Stockholm is doing. It not the first EU initiative for ZEZ, but it seems more often that ZEZ get implemented by making it a car-free area.
To add more context:
"The first phase of the Krakow LEZ will restrict vehicles with EU exhaust emission standards Euro 1 petrol and Euro 2 diesel vehicles, before tightening restrictions further in 2026. After then, only cars with a minimum norm Euro 3 for petrol and Euro 5 for diesel will be allowed in the city (20% of the current fleet will be affected). "
Are you talking about the Low Emission Zone? That seems to be a reduction of high emission cars and not really a total ban as described in the article.
I went there a few weeks ago for the first time in 6 years or so and could easily identify positive changes that make living there more pleasant.
Also while driving was a little slow (as usual), I had no problem finding (paid) parking close to the old town.