IBM ended up buying The Weather Company (Weather Channel, Accuweather) around the time when I was there. Lots of things were getting the "Powered by Watson" thing slapped on them around that time.
Lots of things said "powered by Watson," but Watson was not a single system, nor did IBM actually add value in most cases (see: Watson Health, which was a catastrophe).
It's also possible that was total BS and they paid to put the "powered by Watson" there