The boss is like implying that this is best that can be said about Mr. X that he is really not qualified.

他这样做的目的是想要说 X 先生根本不能胜任任何工作。

youdao

By not mentioning any important qualities related to the job, the boss is implying that this is best that can be said about Mr.X that he is really not qualified.

老板不提及任何与工作有关的重要品质，他这样做的目的是想要说 X 先生确实不能胜任。

youdao

I have said all there is to be said about it.

关于这件事，该说的我都说了。

《新英汉大辞典》

What is said about someone else can also be said about you.

VOA: special.2010.05.09

I'm not at all sure there's anything more to be said about that passage, which I think lays it to rest.

我不确定这篇文章是不是,还要更多的讲解，就这样的吧。

耶鲁公开课 - 文学理论导论课程节选

And there's a lot to be said about this but it could be pretty simply illustrated in language.

要想解释清这一点还是比较费劲的,但要用语言来说明就很简单了

耶鲁公开课 - 心理学导论课程节选

And the whole political fight here is really over what will be said about this Congress.

NPR: Congress Delays Recess in Legislative Push

The same could be said about the melodic imagination of Chopin, which is incredibly rich.

WSJ: Maurizio Pollini: Not as Others See Him | Cultural Conversation by David Mermelstein

You can bet, however, that plenty will be said about the audit in taxpayer circles today.

FORBES: Is SDP Getting Schooled by the IRS?