I think you can back higher tiers, but refuse the physical edition or physical goods. But now that I look at it, it's not even Swastikas there on their uniforms, so I feel you should be okay -- they definitely won't put a swastika on your physical edition, lol (unless Nazi looking outfits by themselves could be interpreted as a symbol?).
The word "Swastika" does appear in the script though (it's used as a codename for a place of a certain LDO ritual... that has really nothing to do with Nazis), and the game has a few CGs like below.
I'm pretty sure I've heard light mentioning they were planning to air the anime in Germany and already sorted out the logistics for that... unless I'm misremembering something. Anyway, you can try backing the digital version for now, and then bring this up on the ks page, for a proper confirmation.
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