is one piece episode 276 filler?

A woman walks through the streets of Ohara, listening to the rumors that a Marine ship has appeared at its docks. The scholars at the Tree of Knowledge are informed about this.

Meanwhile, Robin continues to talk to Saul about her hopes of meeting her mother, becoming an archaeologist and studying the Void Century, a century in history whose study is forbidden by the World Government. She tells Saul that her mother was studying the Poneglyphs.

Saul was shocked to hear that Robin was the daughter of Nico Olvia, an archaeologist who left the island to study the Poneglyphs.