It's considered complicated. It's not trying to do free movement on the map grid where everything is 3D rendered with simple parallax mapping or other strategies though. I think the name for it is something like static (non-free movement), isometric, prerendered views.
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You can open the game to see all the JS plugins that let him do different things with tiles or whatever. You can also check if his map files are openable in the editor like normal.