(You didnt think apple would manually inspect billions of apps and their updates? 2 weeks per app * 1 billion apps * 3 updates = 115 million man years)
And your math is very wrong. Very few apps update every 2 weeks, most of the apps on the app store probably haven't even been updated in the past few months, and there's not even close to a billion apps. In an interview back in January Phil Schiller said the App Store had 2.2 million apps.
I assume it takes one person 2 weeks to fully analyze an app (we are after all looking for well hidden malware, possibly downloaded from network after some use). Times 2.2 million apps. Times an average of 3 updates during its life time.
There are not enough apple employees to pull what you calim. Hence approval is semi automatic, just like Google.
Edit: 1 billion changed to 2.2 million, my bad.
I feel you are just hiding your head in the sand instead of doing the sensible thing which is to ask apple to analyze this companys apps and report to public whether app store was affected.