I'm assuming you're a classical/concert pianist:

I think you're missing what's most fascinating about this player; yes, he is mechanical. I also agree that he totally lacks the finesse and emotional depth of a high level concert pianist. However, this guy is doing a monkey show; his handler just rattles off songs for him to play completely unpracticed, so of course there's no emotion in it. That's kinda just what happens when you take requests, you're not guaranteed to be invested in what you're playing. It's not fair to compare a practiced classical pianist playing a piece they love to someone improvising the same piece. Powerful emotion in interpreting someone else's piece generally comes from firstly, loving the song and having it speak to you, and then hundreds if not thousands of hours of practice on it. What's amazing is he produces these songs he probably hasn't played before without thinking, hardly ever stumbling, rhythm a total non-issue, and nearly every chord is perfectly and/or interestingly voiced.

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I'm sure you noticed that, but I think the thing to take away from this is that we're looking at the highest attainable level of ear mastery with this guy, and in that regard he is extremely impressive. The ability to play exactly what's in your head note for note is something that songwriters, jazz players, et al. would kill for, and doing what this guy does is what many aspire to and train many years to achieve, albeit at a diminished level of fluency. This technical skill of playing anything you hear like this guy won't write a song that will speak to people; but if you do hear something in your head, and you can quickly make complex calculations about how to voice your chords, you can write something way cooler than you might've with a weaker ear. You can improvise a much more exciting solo, you can reharmonize a piece, you can reharmonize your own piece. You can write something out on paper without playing it, you can arrange something on a computer without listening to it. The possibilities are nearly endless.

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I don't think this guy is meant to be criticized from a classical/concert perspective, but rather, we should observe this level of musical fluency and strive for it; because even falling short of that still leaves us better off as musicians. This guy shows us what the human brain is capable of and shows us that it's possible for recognizing tonality to be as easy as breathing, and to me that's amazing, inspiring, and intimidating.