That was the traditional meaning of the word, yes. However it has been horribly misused to push headlines and in the legal arena it has been used to push for harder penalties on what would be considered traditional weapons.
It’s a pet peve of mine because it dilutes the word, but home made preasure cooker bombs have been called WMDs in the US and people seem OK with it.
I mean, the post says so in the first sentence. It’s a callback reminder in light of the explosive pagers.