Yeah, but that cliff was around 40ft, according to the narrator. They aren’t swimming fast enough to hop back up that.

Clearly, they beach elsewhere.

Penguins migrate 100s to 1,000s of km, and can swim great distances. They need not beach near their entry point, and are in the water to feed.

That said, where these penguin fledglings beach would be interesting to see.

<https://animalatlantes.com/how-do-penguins-migrate/>

Clearly I've spent too much time on Reddit, I just assumed they were joking and had reversed the video...