Private Property - question from a Noob

I am guessing the issue is with either this way or this way and this is your note, which would suggest the issue is with the first of the two parts of Smalsteeg. You'll need to sign up for an edit account, then the way with a private section will need splitting where it starts and stops being private (in the default editor, click the way you want to split, then double-click to add a node where you want to split it, then right-click the node and select the scissors to split the way). Once you've split the way on both sides of the private area, click the way that is private and scroll down to change Allowed Access from All=yes to All=private. Save your changes and at some point other websites will get the update.

I notice though that the way is mapped as part of a local walking route which the operator says is marked with red clogs, so you might want to use "permissive" rather than "private", assuming the operator had suitable permissions to signpost the route.