The SS symbol is not a dogwhistle. Dogwhistles are meant to be covert and unassuming to anyone except those within the neofascist subculture, like 1488 and triple parenthesis.

Unlike those dogwhistles, meant only to be understood by an ingroup, the SS lighning bolts are as explicit as a swastika. I would go even as far as to say that they are more egregious than a swastika, as swastikas have cultural signification in some countries that might muddy the waters when interpreting the symbol alone. The SS bolts have no such excuse.

Also it wasn't an automatic filter on german emails, it was a filter on german speakers. German emails configured with english as their language did receive the email, according to comments here.

There is no benefit of the doubt to be allowed here. If they don't have an extremely solid explanation (and LLMs aren't that, they know how to recognize actual dogwhistles, they wouldn't output actual 1940s nazis imagery so famous & standard, unless instructed to), then either someone needs to be fired, or we as the public need to understand that there is complacency for actual nazism within this company.

Again, this isn't some little dogwhistle people might be confused about. This is standard 1940s nazi imagery, on the same level of significance as the swastika. I knew this as a child in the 2000s, as a kid who never paid attention in class and found history to be the most boring topic.