If Tesla (EM) did not sell all that BTC, then it would be more accurate to say that it is an unrealized profit - and EM has stated that it has no intention of selling that BTC, although this may change at any time. In addition, Tesla appears to have bought a total of 46 000 BTC at an average price of $32 610, but sold 10%, so the total amount of BTC is now 41 400 currently worth 2.375 billion.
In Q4 of last year, Musk purchased $1.5 billion in Bitcoin in one of the most adventurous moves ever undertaken by a corporate treasury. CFO Zach Kirkhorn praised the gambit as "a good place to place some of our cash that's not being used, and get a good return on that." By my math, Tesla bought 46,000 coins at an average price of $32,610. In mid-March, it sold 10% of its holdings, around 4,100 coins, at an average price of almost $60,000, booking a profit of $128 million (reduced to $101 million by an "impairment" charge).
I think the point is the unrealized gains are after Musk trashed Bitcoin for being ineffective energy wise, meanwhile they continue to hold crypto knowing well they can profit from it. If Musk truly believed crypto was worthless and an energy waste, I'm not sure why his company would retain their Bitcoin savings. The 10 percent sell off isn't very significant. Their holding because they know the coins have value, despite what Musk wants to say.