All of those are not supported by the evidence in the linked article. They observed specific fixed speeds per provider, regardless of location, time, or load. You're correct that there are emergent effects from peering, routing, etc, but that is not what the evidence suggests is the cause of the issue.
And the specific regulation of "Do not throttle or shape legal traffic based on origin or contents" doesn't require large complicated regulatory intervention. A simple complaint system "we observe that traffic to origin X exhibits dramatically different performance than traffic to origin Y" and response would work basically fine. Of course it would be better if ISPs would behave reasonably without regulation, but we can see clearly that it's not the case.
And the specific regulation of "Do not throttle or shape legal traffic based on origin or contents" doesn't require large complicated regulatory intervention. A simple complaint system "we observe that traffic to origin X exhibits dramatically different performance than traffic to origin Y" and response would work basically fine. Of course it would be better if ISPs would behave reasonably without regulation, but we can see clearly that it's not the case.