If the number of unfilled positions is increasing, that would tend to lower the requirements, not raise them. If the number of filled positions is growing at the same rate as the number of unfilled positions, that would be evidence that the requirements are staying roughly the same on average. (Except I'm sure there some small amount of average improvement and widespread knowledge increase every year that everyone benefits from.)
In any case, it still makes sense for companies to come up with interview strategies for inexperienced devs, and the article at the top is once such way. It doesn't mean companies will interview experienced devs the same way, and in my experience, they don't.
(EDIT I had written some other junk based on me misreading your comment, apologies if you had to spend any time on that.)
But the number of unfilled positions is also increasing, so we are not closing the gap, right?
So the gap is widening, but the requirements to get a position are also going up. That just makes no sense to continue for a long period of time.