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Octopuses are molluscs, and there are lots of land living molluscs, right?

To make things even more murky, some octopuses can actually breathe air out of water (which I knew prior to seeing the page), so I was actually semi-fooled by the article as well. An arboreal octopus is actually not that far-fetched.

>Octopuses are very much a water-only type of organism.

They're not though. Octopi generally don't like being out of water, but they're capable of traveling on land short distances and in fact the Abdopus Aculeatus octopus regularly goes on land by choice in order to hunt crabs in different tidepools. Sir David Attenborough discusses the octopus here, which this octopus was one of the animals featured in The Hunt documentary: https://www.youtube.com/watch?v=ebeNeQFUMa0

People learn new things all the time, but an octopus that lives in trees would probably be pretty famous.