I agree ! The theme is quite disappointing to me...
Grammatically, I guess that "lie" stands for "fake" or "not true", cause your right only sentences can be lies XD
Actually, that's just a theme, we can interpret it as we want ! I guess the word lie can be understood with all its definitions, not only "not true". (I'm french so i'm not sure about its others definitions ? Google Translate is not always reliable)