It's a well known data point. In general, women don't like to marry down, and men have less of an issue marrying down. Think of the classic "doctor marries nurse".
If you Google, you should find a lot of articles about it, as it is an important sociological issue. Now that more women are having a career, in fact, more women than men are having an academic career, it is becoming difficult for women to find adequate men.
Also women marrying up was historically the MOST important mechanism of social mobility (people moving up in status/wealth). Too bad that feminism does not allow it anymore, as any man who marries a less wealthy women is considered to be "abusing his power".
The other claim, women being attracted to men with more money, I am less sure about. I am sure you can find studies analyzing data from dating platforms yielding that result, but I don't know how well they generalize to dating in general.
Edit: perhaps a starting point, but in general, Google should be able to help https://en.wikipedia.org/wiki/Hypergamy
