You like finding oddities!
My understanding is that touching a pink reader is never mandatory. You won’t necessarily get the cheaper fare if you don’t, but you won’t be penalised beyond a higher fare. As with a lot of these E&C anomalies, most people would probably use the LU station rather than NR, on account of the faster journey.
Elverson Road is a mistake, and not the first one. There should be a zone 2 only route.
Imperial Wharf is also potentially a mistake. The via Vauxhall fare is possibly a clustering issue but certainly not relevant for this journey.
Surrey Quays again looks like a mistake.