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I think it’s more about conservation of angular momentum. If the hands didn’t slow down you wouldn’t release it and the clubhead would barely be moving faster than the hands. The hands start pulling up and back as you near impact, which makes the club rotate around its own CoM as well as rotating around the system, which makes it move faster, which as you noted is the idea.    You can watch all this happen if you find a YouTube video of a pro golfer face on and go frame by frame you can measure on your screen how far each piece moves per frame. As those distances change that’s acceleration and deceleration. You’ll see the hands slowing down and the clubhead speeding up

I see, so it must have to do with the shaft being flexible and bending as you swing it. 

The hands have to slow down to get maximum club head speed at impact. They are essentially braking to crack the whip so to speak.

Mickelson explains that. He only does when he needs to hit a chip with hook spin. His demonstration was very good.