It would be nice to see the article itself. I would be curious to see how/if they controlled for selection bias. That is, the summary indicates they took images of the brains of novices and experienced meditators. It does not indicate that they took images tracking changes in brain activity as people progressed from novice to experienced.

I'm not saying that it's implausible that neuroplasticity effects can be found in the default mode network, just that those with the strongest symptoms might not easily (or ever) get to the "experienced" stage and the implied relief.