Keeping in mind the mistake in the HN title (should be "P != NP"), the interesting part of the abstract is this:
> Combined with Maymin (2011), who proved that market efficiency requires P = NP, this yields a fundamental impossibility: markets can be informationally efficient or competitive, but not both.
> Combined with Maymin (2011), who proved that market efficiency requires P = NP, this yields a fundamental impossibility: markets can be informationally efficient or competitive, but not both.
(Note that Maymin is the author of both papers.)