A common example is slavic мат. A repertoire of profanities that simply have no English translation, no equivalent, not even a meaningful loose translation/explanation. The best you can do is find the nearest approximate meaningful English construct, but it's a bit like projecting 3d space onto a 2d plane. You fundamentally lose information.
I'm not sure what you're calling bullshit on. The fact that not all languages 1:1 map to each other especially when some classes of languages have fundamentally different constructs like gendered variants of every word, or the fact that some languages are more or less expressive, or the fact that English falls to the side of the less expressive scale. All 3 of these statements are trivial to verify with a couple google searches without even being a multilingual speaker.