Yes, it IS a strange definition, since it presupposes that anyone who would assert that there is no Hell would presuppose that there is, however, a purgatory. Most universalists, these days, also deny the existence of purgatory, so it is an overly narrow definition.
Thanks for that additional information. How do they account for those who live an evil life, say addicted to drugs, alchohol. gambling, pornography?
I just guess they will be very surprised at their particular judgment at the moment of their death.
I have a theory about that. While some of the writings of the Early Fathers, that are today characterized as origenist, are heretical, others are simply teaching about Purgatory in an inchoate form.
Note that origenism is very much about the Purgatory: it states that divine mercy is so great that even Satan one day will be pardoned. The Purgatory, after all, is not a consequence of there being a Hell, but rather of there being a Heaven.
When the Great Eastern Schism occurred, it became important in the East to extirpate any mention of Purgatory in the patristics. So anything St. Gregory of Nyssa, or Origen, had to say about the operation of divine mercy after death was brushed aside as origenist.
I wanted to make a collection of these so-called origenist quotes and publish it on FR in that light, but never found energy to do it.