Not sure why her post says it ends tomorrow. The SEC filing says 18 months from December 22nd , 2021. That implies either the 22nd at the earliest or the end of the month. Not to mention it’s not true exclusivity, just 6 hour exclusivity per post. He could have already been posting on Twitter if he wanted to.

“From December 22, 2021, until the expiration of 18 months thereafter, (the “TMTG Social Media Exclusivity Term”), President Trump has agreed to first channel any and all social media communications and posts coming from his personal profile to the Truth Social platform before posting that same social media communication and/or post to any other social media platform that is not Truth Social (collectively, “Non-TMTG Social Media”) until the expiration of “DJT/TMTG Social Media 6-Hour Exclusive” which means the period commencing when DJT posts any social media communication onto the Truth Social Platform and ending six (6) hours thereafter; provided that he may post social media communications from his personal profile that specifically relates to political messaging, political fundraising or get-out-the vote efforts at any time on any Non-TMTG social media platforms. Unless notice is given, the TMTG Social Media Exclusivity Term extends in perpetuity for additional 180-day terms. In the event of a force majeure as described in the License Agreement that lasts longer than 30 days, President Trump shall have the right to invoke the suspension of the “DJT/TMTG Social Media 6-Hour Exclusive.” If the Social Media Exclusivity Term were to expire but the License Agreement remained in effect, President Trump would be required to post contemporaneously to TruthSocial and Non-TMTG Social Media.”

https://www.sec.gov/Archives/edgar/data/1849635/000119312522150801/d226205ds4.htm