Unfortunately, the author doesn't mention on which crypto exchange such account was made. Maybe the whole Threads post is a lie, but I have a reason to believe that it is true.
Insider trading will exist as long as the financial markets exist. I wouldn't be surprised, if a member of the Trump administration knew about the new tariffs and made this account. I saw a Youtube video made by a former quant trader, where he explained that prediction markets like Polymarket would be the main place, where insider traders would monetize their secret information, since insider trading on such prediction markets isn't considered illegal.