I'm not arguing against that. I'm pointing out the fact that parking infrastructure is so expensive that even on high-value land you get the kind of thing in the picture. Building dense parking next to that particular stadium isn't worth it.

A stadium alone isn't enough to make a parking garage underground worth the cost of building it.

It has to already be surrounded by dense development. A train station right next to it, all that space taken up by parking instead covered in businesses, restaurants, homes, etc. Then the garage is serving way more than just the stadium and the return is massively multiplied.

Except these cities place stadiums and other points of congregation far apart from each other, specifically so there's space for the roads for everyone to drive between them. Putting vertically dense parking next to those various points doesn't solve the wasted space problem, it just makes everything way more expensive.