that said可以单独用吗

That said, to behonest the only people who ever ring our home phone are our Baby Boomers parent.

这是 2021 年高考考试英语全国乙卷（全国卷Ⅰ）阅读理解文章B上的句子，这里单独用的 that said 的意思是？that 作 said 的主语，有点奇怪。

that said 是习语，意思是despite what I just said（虽然这么说，话虽这样），有也可说成 havingsaid that。用以缓和语气。如：

It’s just a gimmick. That said,I’d love to do it. 那只不过个小花招，尽管这样，我想干。

Much of the book was very dull.That said, I have to admit that the ending was extremely clever. 这本书的很多内容都非常无聊。话虽这样，我不能不承认结局很精彩。

I sometimes get worried in thisjob. Having said that, I enjoy doing it, it's a challenge.我有时会为这份工作而感到忧虑。话虽这样，我还是非常喜欢干的，由于这是一个挑战。

Their work has been fairly good.Having said that, I still think there's a lot of room for improvement. 他们的工作做得相当好。话虽这样，我仍然觉得有非常大的提高空间。

I couldn’t rest my heel on thefloor and work the brake at the same time. That said, taxis are very easy todrive. 我不可以让脚后跟着地同时又踩刹车，虽然这话很好，开出租车却比较容易。

Clearly, you do relate toyour young man and he to you. That said, have no illusions. It might endtomorrow. 显然，你与你的情人相处甚好，他与你也很好。虽然这话很好，请勿有幻想。或许你们这种关系明天就会结束。