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Found some websites containing information about Knight's Cross.
And others information about Max Simoneit.
Obviously Max Simoneit received the the Knight's Cross in World War II on June 4, 1944.
There is also the following book, which obviously used records from the Bundesrachiv:
Scherzer, Veit (2007). Die Ritterkreuzträger 1939–1945 Die Inhaber des Ritterkreuzes des Eisernen Kreuzes 1939 von Heer, Luftwaffe, Kriegsmarine, Waffen-SS, Volkssturm sowie mit Deutschland verbündeter Streitkräfte nach den Unterlagen des Bundesarchives [The Knight's Cross Bearers 1939–1945 The Holders of the Knight's Cross of the Iron Cross 1939 by Army, Air Force, Navy, Waffen-SS, Volkssturm and Allied Forces with Germany According to the Documents of the Federal Archives] (in German). Jena, Germany: Scherzers Miltaer-Verlag. ISBN 978-3-938845-17-2
A better source to find out about the reasons for the decision is the Bundesarchiv in Germany
Dear Mr. Wittenberger,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Records of the German Field Commands, Armies (documenting 1939 - 1945) in the National Archives Collection of Foreign Records Seized (Record Group 242) which consists of microfilm copies of German records. The records are described in the GUIDES TO GERMAN RECORDS MICROFILMED AT ALEXANDRIA, VA: No. 56. Records of German Field Commands: Armies (Part IX). We are attaching an image of the portion of the finding aid describing Roll 1556 at the end of our reply. For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at Archives2reference@nara.gov.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!
Herzlichen Dank für Ihre Infos.
Thank you very much for your information.