Yes, we have. It is only in the last couple of years that we have managed to come to a general acceptance of the multiplicity being real and true beyond a doubt. There are two alters to whom it still doesn't 'feel' real but they at least acknowledge now that it feels that way to them because of the very nature of dissociation.
Which I think sums it up really.

There is so much more we could say on this topic. We had one group that lived and worked through the therapy. Then those other two took over for some years and actively denied that the DID and abuse was real. Now I have taken over to... fix things.

That there can be parts of our selves that are so insulated from the reality of the abuse is a testament to the power of dissociation. They don't remember it, they didn't experience it, they don't feel it, they don't 'know' it.
I think a big part of healing the dissociation is letting them in on enough of the pain to feel its realness.