It's disappointing that this article doesn't address the various animals with a degree of biological immortality (eg jellyfish, lobsters). I'm not convinced that the laws of thermodynamics make (human-scale) aging inevitable and insurmountable if there are several unrelated critters who have managed it.
More likely is that immortal monkeys don't make evolutionary sense given the energy requirements.
More likely is that immortal monkeys don't make evolutionary sense given the energy requirements.