So that is impossible. Tesla lived till 1943. That left him plenty time to join the Nazi party. Show me a link where Tesla said he was a member of the Nazi party.
Thank you. As you have stated, it's impossible. So expanding your logic and thought processes, let's review a few points.
"Tesla was a fucking Nazi". Now you would be correct to assume that I was claiming that Tesla was a member of the Nazi Party, even if it didn't exist until much later.
Now then...
"before". What does "before" means? Oh yes it denotes time. It happened "before" something else happened. What happened AFTER it happened?
"Nazism was even a thing." You guessed correctly. BEFORE the Nazi Party was founded.
Now going back to the "Tesla was a fucking Nazi" part. Clearly it is a metaphor to explain that he shared the same values as many others have shared. Many pro-lifers, probably you yourself too, have told me that Mary Sanger was a fucking Nazi.
For the final English and reading comprehension lesson, I will use this example.
"Martin Luther was a fucking Nazi 374 years before Nazism was even a thing!"