The Smiley Face Douluo's attack may have looked simple, but in reality, that attack of his was filled with tremendous power when it was launched. Even a Title Douluo was incapable of resisting it.
The first skill that he used against Tang Wulin earlier had actually defeated a Title Douluo once and resulted in that opponent's entire body fracturing. That man rested for a year before he recovered.
Only a true fool would believe Hu Jie's words when he said he had not fought a battle for a very long time. For a powerhouse of his level, his abilities would not reduce by much even if he stopped fighting for decades. He would only become even more experienced and vicious.