I always say it and always will: genre labels SUCK. Smooth jazz can describe anything from Kenny G to George Duke, which says nothing about either.
Now, say "smooth jazz," to describe texture, and there is something to talk about. Azmuth fits such description: the buffered sheens of this popping bass, electric jazz don't tell you if the Light As A Feather is great or terrible, just that it is smooth.
This music reminds me of a much more funky, more complex Bob James. The glistening keyboards, popping cymbals and precise, popping four string playing make this substantive work glide down. Your listening repeatedly to this ear candy that happens to be very,very vitamin rich.