In general, there is no point in arguing about a fact. It is either so or it isn't. Just look it up, or, in this case, call the factory and ask. But first, a definition of hand-fitted vs. hand-assembled would probably be in order. I don't know exactly how the two were meant by the previous posters, but here is what I think is the difference:
Hand assembling involves checking part fit as the assembly progresses, and swapping in better fitting parts where appropriate to improve the fit you end up with. This is how S&W did things before WWII. I have a pre-war K-22 my Great Aunt bought for $36 in 1932. The S&W brochure was still in the box when I got it, and describes S&W's gunsmiths carefully matching parts before they were assembled. I have to say, it is the smoothest DA revolver I own and has the cleanest single-action trigger break of any of them. It is superbly accurate when I have the right glasses on to see the little tiny sights they made for target shooting back then. So, hand assembly can result in a very good gun. How good just depends on the skills of the persons doing the work. No surprise there.
Hand fitting, to me, involves changing dimensions of parts. Even if it is just stoning a sear, that is fitting because it is improving how well parts fit together by altering them. My Series '70 Goldcup started out as a rattletrap and when I finished the hand fitting work, it shot the 25 yard group below from a rest. This was using the original Colt N.M. barrel. Slugging proved the muzzle of that barrel was 0.0005" out of round, but it must have been pretty evenly out of round to shoot as it did.
The mount for the Aimpoint sight used to shoot that target was a frame mount that replaced the left grip panel. This is the one situation where slide and frame fit is critical to accuracy because the sight is then registering on the frame rather than the slide, allowing any slop in slide and frame fit to affect POI. When the sights are on the slide, as is more usual, then the fit of the barrel to the slide alone pretty much takes care of business. When sights are on the slide, I was taught slide and frame fit contributed only about 5% to the overall accuracy improvement possible. However, my teacher was also of the opinion that it improved cycling reliability, provided the gun was not going to be packed with dirt or sand (e.g., you didn't intend to re-fight WWI).
That was all based on the very loosest of guns as the base gun starting point. Today, with CNC machined slides and frames, the slide and frame fits are typically enough better out of the box that I think it would be challenge to find an improvement caused by slide and frame fitting. But that's just a surmise. For someone with a good, consistent machine rest setup and a number of guns to work on, it would be an interesting before and after experiment to conduct.