the article has nothing to do with the title it bears; be off (/beside) the mark (/point); be wide of the mark; full of pointless talk; go off on (/at) a tangent; irrelevant ❍ 他的讲演～。His speech is off the point. ❍ 他的辩论完全～。His argument is altogether beside the mark. ❍ 所以太炎先生的第三道策其实是～的。(鲁迅《且介亭杂文二集》143) So Mr Zhang’s third argument is wide of the mark. ❍ 你想，～，能做出好文章来？(梁斌《红旗谱》223)How could you expect results when you were talking to the wrong man?
文不对题
irrelevant to the subject;beside the point;not pertinent;wide of the mark
文不对题wén bù duì tí
指内容与题目没有关系。也指谈话与中心议题无关或答非所问。miss the point, not to the point, wide of the mark, get off(digress from) the subject, be off the point