I don’t think I said that. I thought I distinguished it from the review they do in iOS. For example, in iOS, if it’s evident that an app is violating somebody else’s trademarks or copyright they will not approve it. In Mac OS they are just looking for malware.
And they aren’t doing human “code review.” No human looks at the code. They look at the operation of the app.
With notarization they have automated checks to look for signatures of malware and to check if the code is calling any private APIs or the like, and a human looks to see if there any obvious indications of malware. That’s it.
If you make an app that masquerades as a legitimate app and harvests passwords for customers of some bank in Italy that nobody in Cupertino ever heard of, notarization won’t catch it.