Sedo tries to redact buyer data in sales contracts, rendering them void

This is Phil from Lossless. I got a notification yesterday about someone having bought the domain skyglide.com .

Upon looking through the sales contract I noticed that instead of the other buyer party being listed in it, the data of the buyer was completely redacted. I repeatedly asked for the data, but was not receiving it. I then withdrew my declaration of intention to sell the domain in the first place, since in Germany and Europe the other party is an essential part of a sales contract. Without listing both parties a contract is rendered void. What is your opinion on this? How can they do this as a professional domain brokerage company?