Alice actually used the same glitch there, but used multiple stages to make the loft quite large. (she also did it when it was a lot easier to do) The bed and wardrobe appears to have been placed with the same glitch; the rest of the items are tabletop. Some pieces of furniture (like partitions) don't divide as severely as the stages do, the stage is just really large. The glitch works by the placement of the center marking above the window; for the stage, it causes it to clip out, but for something small the effect is not noticeable.
We never had full access to items like the stages with this glitch before, it's more or less the exact same functionally.
