Note that the post currently links to version 1, which was uploaded in 2012 (https://arxiv.org/html/1202.4212v1). There is an updated version from 2014 (https://arxiv.org/html/1202.4212v2).

For arXiv posts, unless a specific version is under discussion, it's probably best to link to the abstract page without the version tag:

https://arxiv.org/abs/1202.4212

This lets folks see if there are multiple versions of the preprints and multiple formats to view those preprints.