Divinity original sin and divinity original sin 2 I am thoroughly confused

Divinity original sin and divinity original sin 2 I am thoroughly confused

When I visited the SDL site it states that both divinity original sin and divinity original sin 2 were both made with SDL.  Since sdl is 2d only I figured it must have isometric maps like flare does. My thoughts were they take 3D objects and render them in 2d isometric view again like flare does. However I looked at the editor demo for the game here https://www.youtube.com/watch?v=zHf_wNTDNIo where it demos a level. This very much looks 3D and a very obvious 3D camer movement. This editor really has me confused if the game uses sdl. Because that doesn't look like tiles at all To me. Maybe someone more advanced can comment on their content editor.