What he described is less ambitious than Hilbert's Program.
He just wanted to have computers (which hopefully are less fallible than humans) systematically verify known mathematics. While I see this as interesting to attempt, it is also doomed to fail because more math is being produced faster than you can possibly verify it.
Which brings up a dirty little secret of mathematics. You can consider a mathematical proof as being like a computer program that has been specced out in detail, but never run. Yeah, you think that it would work. But if you tried to implement it you'd run into little roadblocks. Most of them you could get around. But you never have any idea what is lurking in there, and no real way to find out.
And no, this is not a trivial problem. In fact entire areas of mathematics have fallen apart because problems were found, and found to be serious. My current favorite example is the classification of finite groups. Nobody has really reviewed the proof. Everyone knows that the proof has flaws. And the situation is serious enough that there is a decadeslong effort under way to find a different proof of the result! (The effort was started by some of the people who made their reputation working on the original proof.)
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