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What does it mean to “unmoor criticism”?

The introduction by Pol Neveux to the complete short stories of Guy de Maupassant (the edition that's on Project Gutenberg - I couldn't pin down its exact details) says the following:

He undertook to write the article ["Boule de Suif"] for the Gaulois and, in cooperation with his friends, he worded it in the terms with which we are familiar, amplifying and embellishing it, yielding to an inborn taste for mystification which his youth rendered excusable. The essential point, he said, is to “unmoor” criticism.

It was unmoored. The following day Wolff wrote a polemical dissertation in the Figaro and carried away his colleagues. The volume was a brilliant success, thanks to Boule de Suif. Despite the novelty, the honesty of effort, on the part of all, no mention was made of the other stories. Relegated to the second rank, they passed without notice. From his first battle, Maupassant was master of the field in literature.

What does it mean to "unmoor" criticism? Where did Maupassant say it, and how was it achieved? I can't really grasp the meaning of the word "unmoor" in this context, and I couldn't find the original French text of what he said.