虽然在手头的词典上没有查到相关例句，但根据 justified 的释义来看，网友的句应该是可以用的。

It is justified for him to sell the house.

It is justified that he should sell the house.

英语词典对 justified 的解释是 having a good reason for doing sth。所以网友的句子其实可以解释为：

It has a good reason for him to sell the house.

It has a good reason that he should sell the house.