is one piece episode 838 filler?

In the present day, Big Mom cries over Carmel's disappearance 63 years ago. Unbeknownst to her, there were two people who witnessed her disappearance that day.

One was a giant from Elbaph who came to check on the Sheep's House, and when he saw what happened, he became horrified and ran away. He returned to Elbaph and told the other giants about what happened, causing them to revile Linlin even more.

The other witness was a cook and former pirate named Streusen, who could turn inanimate objects into food with the Kuku Kuku no Mi.