Not really. Since Miller was dead, no one showed up to make his case so there was no evidence introduced that shotguns were used by the military. Had an attorney been there to make the case, the course of gun control could have been much different. Of course, an honest reading of Miller should have negated the NFA.
Yes, I’m aware that Miller was dead etc. I think the use of shotguns in WWI trench warfare was common enough knowledge at the time That SCOTUS didn’t need to be told. And yes, any honest reading of Miller (or the Constitution) would negate the NFA entirely. We are not ruled by honest people.