To avoid more inefficient back-and-forth, I'll get to the point. The HuffPost article sucks because it leaves basic questions unanswered.
1) Who did they study?
It says over 450 newlywed couples over 4 years. But that's vague. How newlywed? Right after the wedding? First year? First few years? Did they track the same set of 450 couples for repeated followups all 4 years? Or was it just 4 years worth of newlyweds asked only once (soon after the wedding)? Those are totally different things. Either could fit HuffPost's ambiguous wording, because the journalist is too stupid to know there's a point in making the distinction. Also what country was this done in, was it all upper-middle class white people, etc.?
2) How did they measure attractiveness? Self-report? Some neutral panel rated photos from 1-10? If it's self-report, it's obviously confounded with strength of the marriage. Newlyweds with a good marriage are more likely to report their spouse positively, due to feelz.
3) How did they measure satisfaction? Self-report?
4) How did they measure husband's commitment/investment in pleasing the wife? Did they even? Or are they just assuming that's why the wives reported higher satisfaction?
The way it's reported in HuffPost, it's too vague. If it's recent newlyweds and all self-report, it could just be saying that happy newlyweds are both happy and view their spouses positively because they're happy. Ok, cool.
If it's self-report, there's also a major social desirability bias issue. Young people who care about projecting a curated image (very common in the age of social media addicts) are more likely to exaggerate both how good their spouse is and how happy their marriage is. So maybe it's not capturing hot people happier in their marriage, just a bunch of Instagram/Facebook posers lying to the word about their spouse's hotness and their marriage satisfaction.
These questions could be avoided by just 2-3 sentences in concise language briefly explaining who they studied, what they measured, and how, to give some context to the study conclusions. But don't trust HuffPost to know how to do that.