I think the issue is with the interpretation rather than the message itself. They said a german officer, not german officers. There was German resistance to the Nazis. It was to varying amounts of activity and effectiveness as well as for varying motives, some admirable others less so. It wasn't a majority of Germans, but to say they shouldn't even be mentioned for fear that others might think that other Germans might have also been cool kinda feels more like you're saying any resistance doesn't matter if the initial government was formed via a legitimate method, because some large portion of the population supported it.

I think this is a risk of being too sensitive to various dog whistles. The whole point of them is to blend in so they sound or look like normal things but have a hidden meaning, which means normal things can also look like them, but doesn't mean the normal thing now represents whatever the dog whistle is about. 4chan was already abusing that to troll the media with fake dog whistles (which then became real ones because they also fooled people who wanted to use them, but my point is that they were started in the first place to cause conflicts between people who agree when one inadvertently uses some dog whistle they aren't aware of, like the a-ok hand sign being taken to mean white power).

I think the ones actually trying to dog-whistle will have other signs that they are pieces of shit.