Our militias could definitely stand to be regulated better

[gejohnston]

45. Sorry, he is wrong

and it isn't an excellent anything other than a middle school essay or an op ed for People Magazine. It offers no citations, context, or anything else than "because I said so". Half of the op ed was about Citizens United.
What you called the "NRA inspired site" does at least provide valid evidence. This is political opinion written by a lawyer.
Notice your article does not cite the cases involved so others can look them up for context. That shows dishonesty etc. The case in TN, was it simply an argument made in a brief? Part of the winning or losing side? Was it a question asked to one of the litigants? Does the quote even exit.
In short, while you might agree with his view, it is little more than high school level opinion piece. I go with the scholarship, the higher quality the better and take it wherever it goes. That is because I'm a liberal. Part of being a liberal is being free of all dogma be it from the left or the right.
to add
Question, why does the NFA put what was then a high tax instead of simply banning the covered weapons? Answer, because the supporters believed a ban would be overturned. In fact, lower courts did rule NFA to be unconstitutional on its way to Miller, who simply said that a SBS wasn't protected because nobody provided evidence that it was military weapon. If everyone agreed that it wasn't an individual right, then why didn't the NFA simply ban the weapons?

Oh, and neither the NRA or the Brady Campaign wanted any part of Heller.