Does this .. - "slipped through a crack in our disclosure pipeline" .. mean something akin to, "DownDetector Itself Doesn't Detect that It Is Also Down"? or s

Does this .. - "slipped through a crack in our disclosure pipeline" .. mean something akin to, "DownDetector Itself Doesn't Detect that It Is Also Down"? or something like that? Is there a category of security problems such as this? It seems fascinating to me, and severe.