What I would do if it wasn't coming out right would be to play those top notes on the beat (ie, on those rests) until the middle bit felt natural, then start to hold them as marked.
Further, If your not quite sure what the rhythmic effect is that's going on here, I'd probably also listen to several versions of this passage played - score in hand - to get the feel for it. If there's any variance between pianists, Richter is right.