The idea isn't that you have a nice car and that makes you attractive. It just gets simplified to that for caricature.

The idea is, no matter who you are as a person, the version of you that is healthy, fit, and clearly never has to worry about money, is one of the more attractive versions of you. She's not a gold digger, she just wants to be with someone who is financially secure.

The context here is "first date".

There are far more important things to think about on first date such as "Do I like this guy?", not how expensive his car is.

Even "she wants to be with someone who is financially secure" seems to get taken the wrong way.

One relationship has more fun/fulfilling lifestyle options available and the other has fewer. This applies to anyone regardless of gender, although a lot of people have hangups about traditional roles and money.

Right, it makes a lot more sense to judge people on their adherence to a particular muscular profile than on their wealth.

Fitness is an indicator of physical health and ability to defend from predators and fancy cars and clothes are indicators of mental/social prowess and ability to garner resources. They're both valid, if imperfect, criteria by which to judge someone for reproductive fitness.