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I would want very good pictures of the 211J supercharger and a good technical description before saying it used a Polikovskiy type Throttle Body, It did use guide vanes in the supercharger inlet. They rototated with the impeller on some models (all?) but they did not pivot and close off the opening like the Polikovskiy type Throttle Body.
older 211 supercharger
guide vanes do not touch the outer case and appear (although the area is dirty) not to have a way to pivot in place like the 213 supercharger shows.
In fact if you look closely the 213 supercharger appears to have curved inlet guide vanes behind the throttle plates which clearly show their outer pivot points.
Yes, I see what you mean. This version of the 211 just seems to have a fixed swirl type throttle body. Though it must have been inspired by the design.
Maybe an early type (?)
It was difficult enough finding these photos but when I have time I'll see if there are more available.