If you have control over a block of IPs, you can set the PTR records to whatever you feel like. Having invalid PTR records will cause headaches for you in a limited set of cases (e.g. sane mail servers won't accept mail from a host which has a PTR record that doesn't have A and PTR records which refer to each other) but outside of that, the owner of the IP block can do essentially whatever they want with the records.

Someone clever decided to have a very long route to a box, and very clever PTR records.