Hello Tobias,
: those are probably employees of the Building and Planning Office. Possibly architects and civil engineers.
What do you realistically think they "can" check? That the building designation violates the development plan? I have already evaluated many documents; it is a time-consuming task. It is also supposed to enable my client to make a final yes/no decision. No employee of a building planning office will be able, willing, or allowed to do that. I rather consider it a marketing strategy of your provider to include something that is taken for granted in their application documents for potential builders.
As you know, I have doubts about the offer. And although you still rely on "hearsay" over common sense, you should have all documents reviewed by an external office _before_ you sign a single piece of paper. There are countless contact points for this, ranging from the consumer advice center to a lawyer specializing in construction/contract law. This is very well-invested money and will save you a lot of trouble if it turns out that the skepticism expressed here in the thread by the users proves to be true ;)
Rhenish regards