Musk posted the tweet in response to an article about the removal of accounts responsible for coordinated manipulation on Twitter, praising the micro-blogging platform's actions.
Unsworth told Sky News on Wednesday that he could not comment on Musk's latest tweets, but added: "It's all being dealt with, that's all I can say".
Congratulations to Musk, who continues to play himself. "Have you actually done any research at all?"
When Amy Nelson read The New York Times' recent interview with Tesla CEO Elon Musk - in which, The Times said, "he alternated between laughter and tears" in describing "the most hard and painful year of my career" - her first thought was, "I would never cry in front of a journalist as a female CEO".
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The SEC already had been investigating whether Musk's vehicle production forecasts may have misled investors before the regulator started scrutinizing whether he had secured funding for a Tesla buyout, Bloomberg News reported on August 9.
He also said the submarine wouldn't have been able to navigate the complex tunnels of the Tham Luang cave complex, adding Mr Musk was not needed and was asked to leave.
Since then, the two men have been at loggerheads, with Musk calling Unsworth a "pedo guy" and now possibly facing a lawsuit for it.
Musk is known for being unusually candid on Twitter compared to other CEOs, but he has become increasingly combative on the site this year, lashing out at critics and reporters and spurring questions about his judgment when using the site.
Mr Unsworth subsequently said he might take legal action.
Elon Musk is denying that he cried during a recent interview with The New York Times in which he described how he'd become overwhelmed by the stress of running electric vehicle company Tesla.
Musk responded in a since-removed tweet: "We will make one of the mini-sub/pod going all the way to Cave 5 no problemo". "And I'm sure the company's lawyers are telling him that".