Load-bearing. true when this listing was read without the sign-in it needed.

Many sources answer a signed-out search with a smaller result set rather than an error — the call succeeds, it simply saw less. Staying silent about that would be indistinguishable from "nothing new", and the host would record works it never had access to as handled, hiding them permanently with no error anywhere to reveal it. Set this whenever the sign-in was missing, expired, or rejected, even though the listing itself parsed fine.