That's a bold assumption. The methods used for voice and image recognition certainly have a great deal to do with true cognition. It's certainly feasible that Google is playing with a true learning system and trying to teach and grow it rather than just throwing together another chat bot with scripts and trickery. Which isn't to say they've succeeded but just because none of the engines built to date have attained adult human level intelligence doesn't mean none of them are built on simple algorithms which could ultimately manifest complex behavior and awareness just like our own brains.
Knowing exactly how our own cognition manifests isn't a prerequisite to true cognition, a digital system could be completely unique in how it works and achieve true cognition.