Look, I say this as a teacher who offers degree classes, and as a student earning a certificate that says I can teach...

You can earn certificates without learning a damn thing.

I openly can't answer this question for reasons that are off topic here. But I have good reasons to believe that the stories are often true: If you just look at job advertisements you'll very often see very contradictory job requirements that by simple logic and knowledge of, say, programming can hardly be satisfied and simply make no sense for the job. No, say, programmer with the faintest knowledge about his job would write such a job advertisement. On the other hand, if you know the typical hire process, where often the personal manager has a say...