I completely agree with this. A couple of months ago I was doing some pretty intense internal work with some alters. Then ex T wasn't available for a time and the stuff got shelved... it just didn't seem safe enough to venture deeper into that territory without support.
But I look back on that stuff now and think... "Nah, that wasn't real." I have no emotional connection with it at all, and can't imagine having thought that any of it was.

But, yeah - dissociation.