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You're right, not an RS2 - looks like it could be an Audi 80, in which case may be a development mule? (same platform as RS2 - Audi B3/B4 platform).
Guessing its the Rossle-Bau plant (where the 500E and later RS2 were put together, as well as 959).
My first thoughts we’re Audi RS2 as well. The resolution is better in the jalopnik article and that looks to me like a Volvo 480 which would fit with this being taken around 1986.