What did you expect, complete arpeggios and site-reading Mozart? In six months he taught a wild animal to go from nothing to understanding how to interact with a complex instrument, and do so with increasing sequences in response to a reward. That's really cool. Your expectations might be a tad high.
Octopi are already famous for liking to play with things, and it had little else to do in its undersized tank. This is cat walking on piano keys stuff, not increasing sequences. I hope he released the octopus back into the wild after he got bored with it.
