Now I see what's going on!
Previously, the bolding of show/hide links was used to indicate suppressed vs. admin-level redacted revisions.
However with a move to checkboxes, the show/hide links have been removed from some pages. So this isn't clear any more.
That information needs to be reinstated and shown for oversighters on page histories, and also on any other pages which were moved to checkboxes rather than del/undel links. Bold was a good way, what else can be done instead?