it is said that that was all that he said= it is said that t

两句子意思不同
that was all that he said = that was everything that he said 那是他说的一切,他没说别的什么
that was what he said 那是他说的（但可能不是一切他所说的,他说的话我可能没完全告诉你）
what else did he say?
接下去的回答可以是第一句：that was ALL that he said.
两者的区别,关键在于单词 ALL .