Yes. In physics, phase transitions are not necessarily as severe as liquid -> gaseous or something like that.
Any change of property can be seen as a phase change, like superconductor -> normal conductor, or ferromagnetic -> paramagnetic.
That Jahn-Teller-metal in the article does involve some movement of the molecules, though. The article is a bit thin on details, though, and I'm very hung over, so I don't exactly understand it anyway.