I mean IOF are psychos, but that's an APFSDS shell. It's a big tungsten dart with no explosives in it. The only thing it can really destroy is an armored vehicle, since if you shot it at a car or a building it would just punch straight through and make a little hole.
So in context, this just seems like a really tasteless joke about "innocent tank crews". It's hard to find any extra outrage for this specifically.
As a weeb who speaks Japanese... what the hell is he even talking about?
I guess there was an episode of Ragna Crimson with some blatant bowdlerization in the subtitles, but that was more notable in just how absurdly offensive the original was, out of nowhere and for no appreciable reason at all (correct subtitles would have needed the f-slur, for a start). But that's the only thing I've even noticed?