Jared Birchall, who runs Musk’s personal investment office and has been a top advisor in his $44 billion Twitter takeover, made the vow in a text message to activist Charles C. Johnson, the Wall Street Journal reported.
Johnson is a self-described investigative journalist who grew famous for his internet pranks and campaigns targeting left-wing activists, politicians and reporters. Criticizers call him a "digital Darth Vader" and the "troll king."
He was barred from Twitter in 2015 for sending a fundraising appeal to back "taking out" Black Lives Matter activist DeRay McKesson, who called the comment a "serious threat" and asked for Johnson to be banned from the platform.
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Johnson urged that he was using the term "taking out" to refer to his intention to dig up dirt on McKesson, yet Twitter sided with the BLM activist, banning Johnson under its policy against targeted harassment.
The case became an early instance of the social media site's policies cracking down on controversial content, which critics claim are biased against conservatives.
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According to the Journal, when Johnson saw Musk's recent offer to purchase Twitter, he texted Birchall asking: "When do I get my Twitter account back?"
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"Hopefully soon," Birchall reportedly replied.
Johnson explained to the newspaper that while he does want to regain his account, he doesn't intend to return to regular tweeting, stating: "I'm over Twitter."
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Birchall did not immediately react to a request for comment.
The money manager, a 47-year-old married father of five, has worked for Musk since 2016, assisting in managing a fortune estimated at some $240 billion.
Birchall runs what is known as Musk’s "family office" - a private wealth management advisory company that serves ultra-high-net-worth individuals.
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Birchall is further the chief executive of Musk's brain chip company Neuralink, a director at Musk’s tunneling firm the Boring Company and a board member at the billionaire’s philanthropic private foundation.
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The Journal’s new report further shows details of Musk's close relationship with Twitter co-founder Jack Dorsey, and proposes that the iconoclast billionaire wants to reinstate Donald Trump's Twitter account.
Musk remains dismayed that Trump remains barred from the platform after Twitter blamed him for inspiring violence in the immediate aftermath of the US Capitol riot, people who have spoken with Musk recently told the Journal.
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Trump, who recently started his own social media service Truth Social, has claimed that he would not return to Twitter even if his ban were lifted.
Dorsey, who was then CEO of Twitter, is said to have initially opposed banning Trump in early 2021, though acquiesced in the face of insistence from other executives.
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