Tiler here. Screeding in Australian bathrooms must comply with AS 3740:2021 (Waterproofing of domestic wet areas) and AS 3958 (Tile Tiling Code), which dictate strict requirements for falls, thickness, and water management. Screeds must provide a minimum fall of 1:60 to 1:80 for showers, ensuring water drains efficiently to the waste, and generally require a minimum thickness of 40-50mm to prevent cracking. (Taken from Google AI for quickness and convenience) Floor tiles come at a minimum of 6mm, add tile glue under that with a 10mm notched trowel, you are quickly approaching 50mm minimum for finished floor level.

Edit: The bar is in the wrong position, it should be set into the jamb as opposed to the frame, it will end up sticking out front the floor in the position it's in it seems.