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.
That’s exactly what the GSMA is saying. Universal interoperability means not having to use Google’s encryption method, therefore iPhones and all other phones including customized Roms should work.
Now, they could absolutely get in the way of this, but I would hope that they would think it’s not worth the effort.