There's a big difference between serving in the Wermarcht and being a Nazi (meaning being part of the Nazi party or NSDAP).
The article you showed says he was "conscripted" into the Wermacht, meaning he was forced to serve just like millions of German citizens at the time.
The NSDAP had up to 8 million members when the Wermarcht had over 18 million, meaning at least 10 million people in the Wermarcht couldn't be Nazis.
Many people in the Wermacht were actually against Hitler and the Nazi party.
Just like General Olbricht.
https://en.wikipedia.org/wiki/Friedrich_Olbricht
Scooped ya Sylvain, lol