I recall several people on twitter (I follow a lot of distributed systems people / cs professors as it is part of my job to build these things) who agreed with Martin's analysis.
Honestly given Antirez's response I'm genuinely surprised no one has written a TLA+ or similar formal verification proof. Then the outcome is binary; either redlock is sound and works as expected, or it is not.
Amazon's AWS Architect, James Hamilton is a big fan of this approach, as are most of the heavyweights in distributed systems: