Open carry is legal in WI, but be prepared to be arrested for disturbing the peace, as in this case. Particularly in urban areas.
Yes, you are correct. Whether or not you would get arrested for disorderly conduct currently depends on the law enforcement people where you live. That is why it would be nice for the WI AG to issue a directive on this case. He declined to. It keeps things complicated.
I probably would wait to open carry out in public (other than your own property) until this case gets resolved at the WI SC level. You can already carry concealed on your own property (Hamden) so you can do that and nobody would ever freak out about it because they wouldn’t know you were doing it.