What a shitty article. The entire point is "well, they're not wrong that Google is evil and clearly wants to kill adblockers, but they're MAYBE factually incorrect on some aspects", reported by the extension developers themselves (who may or may not be more knowledgeable about this than the author).

Yes, it might be the case that extensions manage to work through the limitations and still limp along. In fact, this is probably what's going to happen. The point still stands that MV3 will severely gimp adblockers and Google knows what it's doing, the factual aspects of which (that the author doesn't actually know about, by the way) are largely irrelevant.