I don't think that's what he meant. The professor is undoubtedly correct, insofar as to how the laws are written. But, as far as the Constitution, none of the amendments were designed to be burdened with regulation. The government has been trying to weasel it's way around the bill of rights since it's inception. Regardless of what the SCOTUS has ruled.
I think the biggest point is that people don't understand, "burden" "infringe" etc. etc. are all subjective words.
I gave this example in another thread, does limiting a car to 90 mph top speed, infringe on your ability to drive 70 miles per hour? This concept kind of goes round and round to all laws. There are numerous regulations and rules to every amendment, we cannot forget that. When we don't like those rules, we need to vote to change; sue if possible, but that obviously didn't work here, but it could in another district.
More importantly, even if the founders didn't intend for said magazine limitation to infringe on 2nd amendment rights, they did intend to provide the current structure of the courts, legislature, and executive branch. This is all by design imo!