tim3l0rd is correct about this, ASL is not a word=sign translation and some signs require gestures that are very animated, and not just the sign for masturbation.
While the sign was repeated over and over and over in the spoof video, it was clearly not that way in the original ASL video. By ASL standards, the WTS videos are properly and respectfully done.
The most important point here is tim3l0rd's comment that the WTS article (and the resulting ASL video for the deaf community) should never have been published in the first place.