Just to be sure you get it, and we dont go round in any more circles, here is how the Collins Gem Spanish Verb Tables and Grammar states it:
"Some reflexive verbs are also used impersonally. The most common are:
creerse: se cree que llegar?n ma?ana.
decirse: se dice que ha sido el peor invierno en 50 a?os.
poderse: aqu? se puede aparcar.
tratarse: no se trata de dinero.
venderse: se vende coche.
got it? Understand? REFLEXIVE VERBS are also used impersonally. Poderse is a reflexive verb used impersonally.
"Some reflexive verbs are also used impersonally. The most common are:
creerse: se cree que llegar?n ma?ana.
decirse: se dice que ha sido el peor invierno en 50 a?os.
poderse: aqu? se puede aparcar.
tratarse: no se trata de dinero.
venderse: se vende coche.
got it? Understand? REFLEXIVE VERBS are also used impersonally. Poderse is a reflexive verb used impersonally.