is attack on titan (shingeki no kyojin) episode 46 filler?

As the Titan form of Rod Reiss drags itself towards Orvud District, Carsten, the captain in charge of the local Garrison panics and asks Erwin Smith why he will not evacuate Orvud's citizens. Hange Zoë explains that the Titan is Abnormal and drawn to high concentrations of people.

It will ignore a small village in favor of a highly fortified city, and that if they were to evacuate Orvud, then the Titan would change its heading to follow them, which would eventually lead it to the greatest density of people in Mitras. That would be a devastating blow for humanity.