I saw that image the first time, and from that angle and depth of field I couldn't make any determination about where Harris was relative to Wade other than a rough guess by approximation of size. I certainly don't see Harris "holding" anything, neither in that image nor in the video where Wade moves cleanly by Harris.

In this image, you can see that Harris is at least 15 cm away from Wade's arm, with his fingers somewhat curled in a manner that they would not be if they had just been removed from a grip on Wade's arm. (i.e., had Harris been gripping or even just raking Wade, the fingers would have straightened after the fingertips lost contact)
The actual foul called, on Nowitzki, I'll grant you. It's a terrible, shameful call, but there actually was contact between Dirk and Wade's jersey, however incidental. There
was no contact between Wade and Harris.