is attack on titan (shingeki no kyojin) episode 49 filler?

Dhalis Zachary meets with Dot Pyxis, Erwin Smith, and two of his Scouts to discuss the syringe left behind by Kenny Ackermann. Hange Zoë explains that its contents seem to originate from some sort of human bodily fluid, but it evaporates when exposed to open air, making it difficult to study.

Hange suspects that whoever made this had access to a higher level of technology than they do.