If you look at this link, it says that Wisconsin Form 2 IS AVAILABLE.
https://care-cdn.prodsupportsite.a.intuit.com/forms-availability/turbotaxbusiness_wi_windows_fiducia...
But at the Wisconsin Department of Revenue site you mentioned, it looks like Intuit has not completed testing for E-Filing.
The other looks like a bug is that Turbotax Business says that E-Filing is required for Wisconsin Form 2. Someone else posted a comment after calling the Wisconsin Department of Revenue that this information is incorrect.
