The dual-mode rear spoiler in reminiscent of the original Tesla Model X unit.
At position-1, the spoiler rises at a 23-degree upslope, dropping the car from Cd 0.2666, to Cd 0.24.
At 170 km/h the spoiler increases it's 'rake' to 31.5-degrees for direct downforce, taking a drag hit from the induced drag.
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Holding a protractor up to a large, side-elevation photo of the car yields a 24-degree tangent angle at the upper body's trailing edge. Regulation golf balls are in full separation at 25-degrees tangent angle.
A true-length image with the spoiler at #1 position will allow the EBLA measurement at drag minimum.
https://www.google.com/search?q=NIO+...QJDj66t34,st:0