Note that if you click through and read the article, the images posted here are examples of early stages of a harder problem that he’s working on - getting faded photos to look good. Some of the examples he has on the page do look quite good (though the algorithm has an affinity for putting people into purple clothes for some reason).
However I’m stuck with the question of “why” - why do this? I can understand wanting to restore old photos but why colorize them? The black and white images that he has posted as “before” images look quite striking in many cases - colorizing them doesn’t seem to bring anything to the table to me. (But I’d love to see more work done on restoring old photos - anything that can help us with the preservation of history is great as far as I’m concerned).