I think the whole reason articles like this are common is that one can easily calculate these numbers from visa statistics, i.e. number of people who didn't get

I think the whole reason articles like this are common is that one can easily calculate these numbers from visa statistics, i.e. number of people who didn't get a job within the grace period. Naturally these kinds of statistics can be a bit off, for example someone might transition to another type of visa instead of seeking work.