Don't make me whack you with my cane, whippersnapper. It's not your standard old-man kind.
Anyway, your disagreement is quite expected. While it may seem hipster or at the very least exclusionist, it's the truth. I think you see BDSM as something with... if you'll forgive the reference... ## Shades of Grey. In a certain percentage of the spectrum, you'd put the 'roleplaying' kind.
However, the definitions that precede that, quite clearly puts the 'roleplaying' kind as... well, just roleplaying. It's roleplaying engaging in BDSM or D/s, not actually going the full mile. It's not in any way or form worth less or less "right" for the people in question, don't get me wrong. It's perfectly valid sex or otherwise interaction. It's just not what they pretend it to be.
BDSM and D/s isn't supposed to be enjoyable and fulfilling to everyone who might be interested, sadly. Similar to pretty much any other activity or endeavor (sports, model building, whatever), there's the actual performance by someone involved in it and there's those with the interest (and even amateur attempts at it) but not quite what's needed to go all the way.
I like rally driving and I've taken a cheap hatchback down a forest road at times, and I watch a lot of it on the TV or the internet, but I'm not a rally driver nor can I call what I've done rally. It doesn't make what I did any less fun nor does it make me any less enthusiastic about it. My neighbor and I ride bikes every day for exercise and fun, but we're not in any way professional cyclists. That doesn't diminish what we do in any way, it just doesn't make us professionals. It doesn't take our enjoyment out of it.
So don't get me wrong, I not only welcome those that just roleplay it or otherwise go the - dare I say it? - casual route, I love seeing them embrace something that used to be very taboo. I just don't call it BDSM until they actually get into that territory.
FakeEdit: I'm on call and was rushed out on an ambulance run while writing this post. Everything is at least two and a half hours late.
RealEdit: Unfucking a quotefail.