VERY powerful Experience.
It's not a "new" label, the concept was first formulated in the 80's and given the name in 1993.
This is why I often say that some older crossdressers aren't very well informed, they haven't done ANY reading about "This Thing of Ours of Varying Kinds" I know you like to grind your "axe" about labels, but labels are just tools, humans use labels for many things all the time.