Hmm, I'll have to ask Stan where he got that info. My info is old, from around 2003, when I was doing a presentation at the Chicago NHC on Belgian Dark Strong Ales and asked Chris to check the data.
Wyeast 3522 is Achouffe; I got that from Wyeast when they first introduced it in 2000 (I think). Whatever year the AHA conference was in Michigan; I asked the Wyeast rep then.
I tend to use the Wyeast versions as well. I did a series of side by side tests and found I liked them better. Unfortunately, I didn't try them across multiple fermentation temperatures. This was about 10 years ago, so I don't know how much the strains have changed.
Basically, I found different Belgian yeasts that did what I wanted then stuck with them. About the only change I've made over the years is adding the WLP510 (Orval) yeast to my list of favorites.