I think another interpretation is that it's become easier for companies to keep jobs "open" and collecting applicants without really having to put in effort to find people. Or, to put it another way, the idea of an "open job" has become meaningless, if it was ever meaningful in the first place. As a metaphor, we can imagine many people wanting to buy apples, but not being willing to pay the 1$ the supermarket will ch…
I've seen it happen with some startups that jobs are posted as "open" to attract applicants when they are not really hiring, or not removing those postings once filled to passively collect resumes and make it look like the startup is bigger than it is. I really don't like this as it hurts the applicants time and distracts them from finding a place that does want to hire them now.
It's pretty easy to puncture that though, simply ask how many open positions they have for each department and when the last hire was for each department. That will show quickly whether or not they are actually growing and at what rate. (You can't lump them all together because with a larger company one department may be growing while another is declining).