If they used their terms properly, the rest of us might find it easier to do the same.
No. They made that change at our request. I asked them specifically to do that on behalf of UK-Yankee at a meeting with them in early 2008 because the variations in terminology were getting badly out of whack. There's a contemporaneous thread explaining about it.
Briefly, they needed to rationalize the terminology on their site. They agreed to that and have been doing it for a long time.
The next BIG round of changes is scheduled for June, and of course we'll keep an eye on it.