I don't think I'm alone in this: I googled Kepick and Oona and found a reference from a 2012 blogpost: https://nwccapstone.blogspot.com/2012/02/meet-oona-and-kepic...
So I have to ponder how bouba/kiki diverged into kepick/oona. Kinda wonder if some random schoolteacher remembered the study but didn't remember the exact names, substituted something similar, and then built it into a curriculum that got picked up by the education system.