You know how peoples used to have folklores and stories that got passed down? Well, we still do, but the culturally transmitted information is now stuff like "Oh, yeah, those requirement lists are bullshit".
I really think it's as simple as having friends/peers in the know-how or not. Some people have family members, classmates, maybe even majority of their social circle working in IT which obviously exposes them to inner workings including this issue with job requirements. And then there are people whose social circle is far from IT so they just don't have confidence to (pretty much) lie on resume.
I actually think this _worse_, let alone _much harder_ than simply telling HR to chill with that shit.
It's commonly talked about in a lot of places online, including here.
It's also something you very quickly learn when searching for your 1st job. If you take minimum requirements at face value, there's almost no jobs anyone straight out of school would qualify for.
It is definitely cultural knowledge that not all people have, and, more to the point, an understanding of what parts of a particular job ad that are stated as MQs are likely to be nice-to-haves and which are real MQs and which are nice to haves behind which are hiding real MQs (such as “Ph.D. in <field>” really meaning something like “a Ph.D. would be nice but a Masters is a hard minimum”), and therefore, how to evaluate whether it is worth expending effort applying for a job is non-universal cultural knowledge.
This often requires understanding of the hiring cultures of the particular job-field, industry, employer, and sometimes organizational subunit. Which is, for people just starting out (or looking outside of their past experience), highly network dependent. And equally substantively qualified people from underrepresented demographics arr likely to have weaker, in terms relevant to the task at hand, networks and therefore less access to this cultural knowledge.
> It's also something you very quickly learn when searching for your 1st job.
Or not, in part because there are lots of places where its not true and if you act like it is you will learn hard.
Lying about requirements in hiring may be common, but it is not a universal norm, and calling it out and denormalizing it is a good thing, even outside of discriminatory impact, but its also very much a practice that has particular adverse impact on underrepresented minorities.