Survivor Self-Referentiality Discussion

On RHAP, Rob had mentioned a few times how the players on Amazon were discouraged from referencing past players or seasons by production. In Australian Outback, I heard likewise; production even warned the players they wouldn't get televised discussing the players and events from Borneo.

Conversely, 47 had at least a few instances explicitly referenced players or events from previous seasons. Why is such discussion no longer discouraged but seemingly now encouraged?