Because 3 weeks ago shows that we're ready to move on from Norm. Acknowledging that fact doesn't take a thing away from Norm or Ferentz.
Instead, it looks like Ferentz refuses to let go. If he knows who the new coordinator is, then just name them and move on so we don't have to deal with stupid speculation, like whether we'll find out who the new DC is from a recruit because they were told (and only told this huge state secret because NCAA rules might demand it).
And that's really a big problem for this program in general: they just flat out seem to revel in letting speculation run wild, when if they knew the first damn thing about PR they could head off some of the crap.