Yeah I think the idea of Unicron as "Chaos" or "Evil" is sort of a widescale misunderstanding. Forest Lee's arc which you posted above makes it clear that ideas like death, entropy, etc. come from Unicron, but Unicron is still explicit that they are poor representations of him. He doesn't seem definable in a conventional sense, especially factoring in the abstract nature of the Tree of Life which, again, would only be attributed to half of him at best. The fact that he ate the rest of his species prior to Primus' birth also showcases he has no issue dealing with similarly abstract beings.
Also want to note that Alginment, Furman specifically calls the gods (and in the TF Guide, says this realm Liege Maximo was ascending to is the realm of the gods) "not real", and that "unreality" would pour into the universe and destroy it during the Alignment. Furman used the term Unspace in the old Marvel run, so I feel that if this was meant to be just more Unspace shenanigans he would have said that in the story.
Also want to note that Alginment, Furman specifically calls the gods (and in the TF Guide, says this realm Liege Maximo was ascending to is the realm of the gods) "not real", and that "unreality" would pour into the universe and destroy it during the Alignment. Furman used the term Unspace in the old Marvel run, so I feel that if this was meant to be just more Unspace shenanigans he would have said that in the story.