I can confirm this is still happening. I’m not sure what other information would help to get an answer on this – it’s pretty clearly some sort of disconnect script running to prevent people from just chatting/jumping in place to avoid being disconnected. Sometimes the intervals are really predictable, almost down to the hour.
Even if the benefits of kicking everyone seen as idling outweigh the benefits of allowing roleplayers to roleplay (on designated roleplaying servers), it’d really help to get an answer of some sort.