Reading between the lines, I think what the author is trying to say is that the editor uses an immediate mode GUI - that is, the entire UI is repainted from scratch at the frame rate eg 70 times a second. Like games do.

That probably keeps a GPU occupied. It can be more responsive, because no matter how many widgets are updated the screen will be completely up to date 14 ms later.

I think Blender works like that, because a lot of the GUI is intimately linked with the 3D scene. Whether to makes a noticeable different to a text editor, I am not sure but I'll keep an open mind until the Linux version appears.