Remember we do have ocean worlds in the outer solar system. Maybe they just got tired of the cold oceans out there and migrated inward towards the sun.

Thanks for posting. I really enjoyed the comments.

At best the conjecture is highly speculative and not supported by any evidence. 'No, Octopuses Don't Come From Outer Space:' [livescience.com]

Octopuses are obviously not aliens, and even suggesting it shows a severe stupidity, or an insecurity that results in asinine proposition. The Hoyle-Wickramasinghe (H-W) thesis of Cometary (Cosmic) Biology remains similarly unfounded. Evidence, not armchair speculation, drives science. Shame on the Journal for publishing this bilge.

It was quite interesting when this popped a few years ago (2018). However, it would appear that octopuses are from this world, but are different to most other life. They may be the last survivors of a more common complex life form which suffered a mass extinction event in the far distant past.
That said, the argument is not conclusive and these interesting creatures may be the product of panspermia where life may have traveled to earth arriving some 230-270 million years ago.

Extraordinary claims require extraordinary evidence.