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Art is not truth; art is a lie that enables us to recognize truth.

Sounds a lot like
Art is a lie that enables us to realize the truth
which is an aphorism by Pablo Picasso.

 So, assuming it's not just a crazy coincidence, David Shields was alluding to Picasso's words. It also relates back to the opening aphorism, "art is theft," which is also by Picasso. We can draw two conclusions from this: 1) Shields is a fan of Picasso and 2) Shields agrees with Picasso.
The point of this manifesto is that art cannot be sold as property, it should be available for use and growth by all similar to scientific findings. Here he demonstrates that belief by putting it into action with Picasso's quote. The aphorism also shows that art's main use is to show us things. The purpose of art is to learn something from it or see something in it. Basically, the point of art is more than art. So, it should be impossible to copyright or even steal because art is not even itself, it is something that leads us to something more. And, according to Picasso and Shields, that something more is truth.