It is worth noting that CALMEC has been around for quite some time and has a very interesting molecular memory/switch based on chiropticene. So it would appear that there are multiple molecular models competing for idea space and what is needed are things like access times, molecular stability, memory storage density, etc. i.e. the standard figures of merit that one applies to traditional storage mediums.

The chemistry is zinc porphyrin rather than rotaxane or catenane. There is a paper online about how it works. The paper's authors are probably connected somehow with the ZettaCore principals. Interesting stuff.