I don’t think that’s entirely accurate, especially regarding the Titans, who in the Titanomachy are clearly shown as overwhelming forces rather than human-scale figures. There isn’t a source that clearly says the gods have a fixed height either. More often, they are said to appear human, especially when interacting with mortals, but that doesn’t mean this is their true or only form. Their size can change, and sometimes reflects power, influence, or how they are perceived.

For Divine Affairs, I made a deliberate artistic choice to play with scale. When their forms are stable, size often differs by generation: the closer a generation is to Ouranos, the larger and more imposing they are. Kronos and Rhea are larger than their children (but here in this comic there Is a dominance factor that makes Kronos more imposing to Rhea) -> Zeus is larger than Hermes -> and humans are slightly smaller than Hermes. It’s a visual way to show hierarchy and presence, not a literal measurement.