That pdf uses Ourworldindata as a source.
The figures from that site quite clearly show that there were indeed excess deaths in Germany in 2020.
Either your source is lying, or you are.
https://ourworldindata.org/excess-mortality-covid
ETA: I am not using the word 'lying' lightly. A stupid person might not have realised that the source used in the article does not support the claim. You, however, have been at pains to tell us you are the smartest person we are ever likely to encounter. That means that, of course, you checked the source, and you are well aware that it doesn't support the claim, but you're repeating the claim anyway. Which means you are lying.