I would say the same but here are the reason why ERBoH didn’t include those.
1. Swatiskas would demonetise. The video due to Nazism (the 45 degree German Nazi one.)
2. It’s on English because the most world understands English (the other side Chinese). Making Hitler rap in German would have an alternative and weirder rhythm.
3. Vader Slashed Hitler in the 3rd ERBoH (which isn’t the real one) but this is the first episode of the trilogy of Hitler vs Vader.
4. This is ERBoH. It is allowed to use Historical figures for their videos. Yes Hitler did either commit suicide or fled to Argentina to live for the rest of his life. But we wanted to use him against darth Vader. So why conplain about timelines. They made it for fun. So go whine somewhere else. Nerd