The definition of the mediator pattern
is "provides a unified interface to a set of interfaces in a subsystem". Regarding this definition, the answer is definitively yes.
By default the Mediator class constructor in PureMVC only has one viewcomponent parameter but you can add as many viewcomponents in parameters as you want in your subclass. You can also manage a list of view component from a Mediator class, in this case your viewcomponent contructor parameter is null.