The numbers/graphs were very definitely not taken from the OOH. They're from the same underlying data source as the OOH, the BLS national salary study, and they're both calculated differently and substantially broader in scope than the numbers presented on the OOH. It should not be surprising that the OOH and this site have the same number for e.g. median salary of accountants, since they both use the BLS data set and presumably have the same understanding of the word "median", but the point of the site is to get a generalizable numbers for the degrees, where the OOH hsa 100% focus on the job categories and generates no statistics whatsoever for degrees.

There may well be rewriting of OOH facts on some of the pages. I likewise haven't read the several hundred pages in detail (I wrote the CMS but wasn't in charge of the freelancers who filled it out).