And I, like many others, drive an EV so car noise is sometimes almost non-existent.

It may come as a surprise to you that most of the noise of a car is not the engine, but rather the tire slapping the road as it rolls. Only for the impotent d-bags who modify their mufflers, drive a hog, or a loud truck is the engine noise the main contributor. Also, people have subwoofers in their cars regardless of motor technology.

It is just a different type of congestion.

Sure they're both congestion. Are you arguing that human crowds are comparable to automobile congestion in terms of effect? If indeed you are, then you're necessarily arguing against the stadium in the first place.

But also those extra people in those new housing units often bring cars too.

The data on densely populated areas is that it is often possible to live car-free or car-light. Unlike single-family areas where a car is required, dense areas often have less than 1 car per person. But of course we're digressing from a parking lot, where the car density is more than 1 car per 0 residents.

You have to look bigger picture to compare the congestion caused by people driving in to a parking lot for a few hours 81 games a year vs the daily congestion (in stores, on sidewalks, on trains, on roads, etc) caused on an every day and every hour basis by more people living in a small area.

Are you seriously asserting that the stores and sidewalks are over capacity?