Much simpler answers
In nature, the ozone hole comes and goes, and I'm willing to bet that it has done so for a million years.
The article you quote shows how the scientists defending the "humans are destroying the ozone layer" deal with the random fluctuations.
Hole getting smaller? Our forced elimination of "ozone killing substances" to the tune of billions of dollars and half-assed replacement technologies worked!
Hole not getting smaller? Or even bigger? Well, it needs more time to work. Or something. But it will, just wait!
Or maybe it's global warming screwing it up? Yeah, that's it! Global warming! Wow. That works on SO many levels for the scientists.
Geez.