The article addresses this: > It turns out that AirPort Utility is code signed with the exact same certificate chain as the old version of Airfoil Satellite. S

The article addresses this: > It turns out that AirPort Utility is code signed with the exact same certificate chain as the old version of Airfoil Satellite. So if there is a problem with the old signing certs, whether expiration or something else, the problem still exists with AirPort Utility. Presumably this fact would also rule out the (highly unlikely) possibility of private key compromise. If an Apple key was compromised, why would they go through the effort of resigning old third party apps but not one of their own?