Since words have to mean stuff, I would definitely call it immediate mode, it's not trivial at all to hack a generic retained mode UI library into being as flexible to what's on screen as ImGui. A generic retained mode design would more rather require pointers to some dependency state to check per update, with ImGui the schema gets rebuilt constantly, instead of being reactive. And there is definitely use cases for this design, constantly changing stuff would probably fit with Dear ImGui or others better than with a generic retained mode UI toolkit.
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