Remember ‘reporters’ ain't the brightest of God's creatures.
After all, in his eyes all powder is black and modern powder is smokeless. Ergo, Smokeless Black Powder.
I did not see anything that told me when the powder was first stored. My guess is some of it has been there since WWll and is smokeless.
6,000,000 pounds is a hell of a lot of powder, smokeless or black powder.
Maybe we well get lucky and they well surplus it out.