Humans can mimick killer whales

I've listened to apparently whales mimicking humans, but it sounds more like humans trying really hard to make human words sound similar to sounds killer whales can make. Humans are so easily influenced and I guess a lot of the students working on this research so want this, that they don't realize they are actually mimicking the killer whales. 
​The BBC headline with this The killer whale that can 'speak' but if you took away the the human speaking in the video below, you would not recognize any of the sounds the killer whales are making as human words.