is attack on titan (shingeki no kyojin) episode 84 filler?

The night before, while most people are asleep, Hange Zoë interrupts Jean Kirschtein's fantasy of a pleasant life in the interior to call him out for a meeting. Despite his misgivings, he goes out to meet Hange and Mikasa Ackermann, who brings them up to speed on Levi Ackermann's condition and their new alliance with some stragglers from Marley.

Hange plans on stopping Eren Jaeger's plans for genocide, but first they will need more allies.