Yes, it's a genetic study that tries to identify genes associated with income. Yes, these people take themselves seriously and also seem oblivious to the eugenic implications of such a study. Yes, 71 authors, all presumably with Ph.D.'s think the following is good science:
The meta-analysis across the income measures led to a substantial increase in power, which allowed us to identify 162 loci tagged by 207 lead SNPs (Fig. 2). Of these loci, 88 were newly identified compared with the previously published GWAS household income result conducted in the UKB.
The previous GWAS found 149 loci (that's not really accurate, but by some statistical manipulation I believe also used in this this study, they went from 30 to 149). The math here leads to the fact that although 88 novel loci were identified, 75 that were previously cited in the last study are no longer significant. Thus, while tripling the dataset, they barely broke even. This is a good sign that they are looking at false positive results and that there aren't really any reliable genetic correlations for income. This is the same stunt that was pulled in the depression GWAS I discussed recently. If you significantly increase data size, you should expect far more associations, even if these are false positives, so the fact that only a few more are seen and many are lost suggests that the new data did not have the same pop strat working for it (it was not UK Biobank data). This is really bad science. And the amount of time they spend pouring over these false positive results is embarrassing.