My understanding is that their was a loaded glock in the car. That was “ready for use” not stowed.
The right to keep and bear is mentioned in the 2nd amendment, though not created by it, it serves as a documentary source for asserting such a right.
I suggest that it would be fairly well settled that one can not be prosecuted for exercising a right. That practice would constitute an immunity. No, the definition of immunity is not in the second amendment, nor anywhere else in the constitution. That definition would have to come from common law.
The story mentions finding a loaded glock sometime after the illegal search (IE: the flimsiest of pretenses)....but not where where it was found. I’d presume in the same bag as the rest.
Even unloaded, a gun, a tool, is ‘ready for use’, even as a club.