Hello @grassi2000, I don’t think it “the German problem”, because the text of the notification is different and the word defamation (“Diffamierung” or “Verleumdung”) is not mentioned, like others including myself did report before. The text, you quoted, is rather generic and doesn’t say anything specific.
Nevertheless you might want to read this thread: Two years later my honest review got me a defamation strike?! - #7 by ErmesT anyway.
Anyway, in addition to @MortenCopenhagen’s tips, one more (I believe more important) suggestion:
If photos or videos are attached and only one is rejected by the filter, the entire review including all other attached media will be hidden to the public. So, the reason for a rejected might not be found in the text, but one photo or video was (possible falsely) tagged by filter.
I never experienced a review being rejected after a long time (unless the place was deleted), but it did happen several times for photos posted directly to the listing. In those cases, an appeal did help for me.