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Why do you think it's mutual when Twitter is suing him for backing out?

The deal can be stopped by a third party which is not the case at this point. See another grandchild comment that expanded on that.

Why do you think he thinks it’s mutual?

The phrasing could be read that way “No. The $1B clause does not involved the two contractual parties pulling out of the deal.” (Emphasis mine)

I think OP may have intended to say “one of the two parties”