"Oh, bullshit. You've fallen for marketing. No one voted them in charge of the dictionary"
This is not how standards bodies work.
NGMNA is simply a working group of mobile networks and handset makers who sit around and come up with a set of standards as to what will be called "5G". For 4G they settled on the LTE family of protocols of which LTEX is one of those standards. They are recognized by governments, standards super-bodies such as the IEEE, the mobile handset makers and the networks. Thats as close to "voted in" as your going to get.
No you dont get a say in it, unless your making handsets or own a mobile network, anything else is solipsist nonsense. Words actually have meanings dude, and they are not "Whatever I stamp my feet and demand to be true".
NGMNA's current prototype is based around the Snapdragon X50 modem which runs in the mm range (around 28ghz range) and supposedly can operate at a burst bandwidths of 35gbps.
Which is actually ridiculous and I have doubts they'll give consumers that much to play with. But a "generation" in mobile networks is around ten years, and we're still a long way off anything the NGMA and its member companies will agree on as worth locking in for a decade as a standard