Just plain wrong. You can swipe sideways at the cueball, off direct aligment of the shot (also known as back hand english) and your wrist may add this. You can also increase cue speed by using some wrist motion on your stroke, adding more spin. But your wrist doesn't cause the cue ball to spin, hitting it off center does.
As for aiming off center, there is nothing methodical about it, as much as we'd like to think it is some top-secret aiming method. It is simply and individual preference. Both Basavich and Bustamante have a pre-stroke that differs significantly in mechanics from their final stroke, but since that difference is consistent they've learned to adjust.
There is an attitude in pool, along with many sports, that there is some large secret esoteric body of knowledge that involves doing minute physical actions or some odd visualization that will automatically help your game. I killed a year of practice trying to find and "remember" these little gems that would make me pro. At some point I started playing pro players more, and lo and behold, they had no secret method. They simply stood still, knew where to aim, and delivered the cue consistently. Once I realized this, I stopped searching for weird things that may or may not help and focused on the simple things I knew would help, and dare I say I may be able to beat a B player now every once in a while

. Just last week I came across a player in a bar who had a nice stroke but complained of his draw and asked me how I got the action I did. He asked "its something in the wrist right, you turn and snap it, a great hustler told me this". I had him line up the shot, make sure his cue was low and level (he was not cueing low enough) and that he followed through the ball, and stroke slowly so as not to punch the ball, and low and behold he had a great draw. As much as we might wish there is a hidden kung fu of pool that can only become known to you if you are a pro and a zen master, in reality the game is about doing all the simple, obvious stuff very consistently.