Of course he believed it. Your point was about Germany being aware of the place and time of the D Day landings, they were but were told it was a diversion, by the time they figured out it wasnt a diversion the Allies had broken out of Normandy. You are just moving goalposts pettifogging and denying. The point is the usefulness of breaking codes and deception which is actually beyond doubt except in the minds of revisionsists with a new theory.If he believed it, why did Das Reich ,located at Toulouse, receive the order on June 6 to go to ..Normandy ?
Why did he transfer 2 PzD (9 and 10 SS ) from the East to ...Normandy ?
Why did he order the second tank battalion of Panzer Lehr that was moving to the East on June 6 ,to return ...to Normandy ?
What he said to the Japanese ambassador ( if we may believe the Japanese ambassador ) was contradicted by what he did .
The German strategy was not dictated by Fortitude,not by the belief of a main attack ( a diversionary attack was as dangerous as a main attack ) but by the FACT that,as the French in 1940, Germany had to defend the whole coast of Western and Northern and Southern Europe .The allies could attack everywhere ,especially where there were no or few Germans .
The Pas de Calais did not receive any reinforcements after D Day,for the simple reason that there was no landing at the Pas de Calais .
The reinforcements were sent to where there was fighting .