is one piece episode 123 filler?

Luffy's body water got dried out by Crocodile leaving Luffy close to death. However, the water he had shot out at Crocodile came falling and landed on him which brought him back to life.

After Luffy recovered, he went searching for Crocodile. Nico Robin and King Cobra, on the way to the royal tomb, encountered the Marines and were ordered to surrender, however she overcame them easily.

Sometime afterwards, Crocodile came by and laughed at them for being easily overcome.