Among the authors I found in the registry are Harlan Ellison, Ursula K. Le Guin, Samuel R. Delany, and R.A. Rafferty. You won’t find them by searching for their names in the author field, but the anthology in question shows up in a free text search using their names. Although ReLIRE doesn’t present the catalog details, apparently it does use them to present search results. Here is the catalog listing from the Bibliothèque National de France.
Now that some prominent American names are in the crosshairs, will this news finally get some goddammed traction?