Hi,
we have discussed this changeset on the local mailinglist and a mapper was on site to verify. The edit is definitly wrong. 
At the lower end of the road part carrying the oneway there is a Zeichen 250 aka "Closed for vehicles". 

Yes - this is a very strange way of posting a oneway, but still the road may not be used uphill for vehicles.

So we came to the conclusion that reverting this change would be the right way to go.

Flo