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I am not buying into the video posted by Bansky. The knives have an awkward angle, how are they supposed to cut?

I think he added something else to the frame afterwards. Something like this banknote printing machine: https://www.youtube.com/watch?v=OE7qHz_cVew

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The EEVBlog YouTube channel (someone else already linked it) covered the implausible shredding mechanism in the Banksy video. https://www.youtube.com/watch?v=SdKdQWhlNTY

In addition to the impossible angle, the position also does not fit a plausible paper path, and you can also see the curvature indicative of being stuck in the roller of a traditional shredder for days/weeks/months on the bottom of the paper coming out.

Makes you wonder how the previous owner could have not noticed the shredder. "There is a slot at the bottom of my insanely valuable Bansky artwork's frame and I can see parts of a machinery through it, but it probably doesn't mean anything."

It'd already been noted that the frame was unusually thick

The video was made by Banksy. Why do people trust it?

Did you read TFA? The suggestion is that the artwork was partially pre-shredded, with the shreds hooked over the blades, and then it's just a case of pushing the rest of the piece through the blades. Like "dragging scissors through paper" once the cut is already started.

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