Does Zaibatsu loyalty stop me from accessing cards at the end of a successful run or does this just refer to cards that allow you to peek at un-rezzed cards? some clarification would be appreciated.

Zaibatsu Loyalty protects you from Infiltration at present. I imagine it will be more useful later. Accessing cards is not Exposing cards, unfortunately.

Don't forget Lemuria Codecracker (Criminal, core).