I wondered about that as well - I agree that modularization fits better for what they’re doing but I guess they went with disaggregation to emphasize that they are pulling the monolithic chip apart rather than modularity of how they’ve done it? I dunno - I’m assuming that’s a word that Intel used rather than Anandtech coming up with it on their own since Anandtech kept using it over and over and over again to describe Intel’s strategy.
I'm a bit surprised that they are doing this for mobile as well. I'd expect that no matter how efficient the tile-to-tile connections are, they will always have some (low) energy overhead over keeping the signal within one IC. But this approach makes sense from cost-saving perspective.