@limes11 : Actually, these buildings are only visible on the ESRI clarity images and I can not find a date. In all other layers there are no buildings visible and if you check with google maps satellite image that does state it is from 2020, there are no buildings or any uman made changes in the surrounding grounds visible whatsoever. Plus I stated I was there about 5 months ago and also surveyed with my own eyes that the buildings that were there before are indeed gone and everything looks as if no farmstead ever existed there. I lived there in 2018 and this was my daily bike trip to work, so trust me I know the place. 
@ Map-Peter: Thanks for the links, I will check it out later. In this case, however, I am really not convinced of leaving any sort of building there, because in my opinion it is misleading of the ground truth. As stated previously there is not any evidence currently at the site that there ever existed a building, the land management office really did a great job of returning the site to nature. So because there are no ruins or whatever left, I feel leaving a building with a different tag there would not show the truth to someone who is just looking at the map and not digging deeper into any tags. But maybe your link will clear things for my understanding.