@mathowie OK, so this is weird. I saw a presentation two weeks ago *by a lawyer* that used probably a dozen CC photos, every single one with its CC license status, every single one credit to “Unknown Author.” Capital U, capital A. Not “photographer, but "Author." The same as in your example.
I wonder if this the fault of some tool (e.g., Figma) that makes it easy to find and add CC-licensed images, but doesn't credit them?