You want to talk about absurdity? Do you know what reasoning was used to (basically) outlaw short barreled shotguns? Because they are not used by rhe military! How’s that for logic?
If SCOTUS upholds this decision we will have an interesting situation won’t we? That would make two opposing SCOTUS decisions. One claiming that only military weapons are covered by the 2nd Amendment and the other saying that no military weapons are covered by the 2nd Amendment.
In that case all laws regarding weapons of any kind would be null and void. The law would be an outlaw, a violation of the principle purpose of the law. Time to hoist the black flag and draw cutlasses.