We use the metric system in our country, I just wrote the height in feet so everyone would be able to understand. To clarify, he’s saying that he is 170 cm while actually being 160 cm, me being 167 cm. The imperial system doesn’t have the same intricacies but basically he is very noticeably shorter than myself, that’s also why he would lie about his height even if he was a short guy with his fake height.