Granted, I could see how someone could make the argument that what is anathematized in the statement above is not the claim that "universal salvation will be a reality", but rather the more limited claim that "souls pre-existed as spirits in communion with God before their earthly lives AND thus they will all eventually return (the "monstrous restoration" to their original condition) as spirits in communion with God".
Precisely what I would say. We must remember that those anathemas were against Origen and we must interpret their meaning in light of Origen's teachings. Teaching that everyone will retain their bodies and will all eventually through an act of their free will choose to accept the Kingdom of God isn't what Origen taught and thus likely not at all what was addressed at Constantinople II, especially given that the council did not endeavor to condemn Fathers who had held to non-Origentistic forms of universalism.
though Church tradition would do so, distinguishing "universal salvation" from "the hope for universal salvation".
But do you even have a concrete instance of a condemnation that leads you to believe this? Or are you just guessing?