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I don't think it is actually contrary to those other studies. The austrian study randomly selected among the whole population whereas the german study used a cluster connected to a hot-spot. IMO it is measures like social distancing in place for more than 3 weeks at the time of sample-taking in austria that reflect in the data.

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It does. The german study was conducted in a town that was relatively heavily tested during its outbreak, and only recorded 2.5% official infections in the population of that town, so the german study showed the actual number to be 7 times as high. This Austrian study found this number to be only ~2.5 times as high. Germany and Austria overall seem to test fairly similarly.

The austrian number says currently active cases are probably 2.5 times as much as official numbers.

German study says in a community linked to an outbreak, there are 14% immune and 2% to be shedding viral DNA.

Austrian study didn't include antibody test (yet).

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