that is 1 billion dollars profits at the present Bitcoin price.
That's only on the paper. As people said, unrealized profit.
1 BTC = 1 BTC. As long as they don't sell, there's no actual profit to talk about.
Nice bullish (for newbies) news though

They will think it will be sold, of course not and will still be hold by Tesla.
Sometimes they misjudge the title with profit, the fact is that it is only an estimate now if it is sold at a price of $58k, it is clear that Tesla will get a big profit, but this can make FUD news because maybe some if you don't understand the content of the article, they will continue to sell it all even though the reality is no.
There is no profit if it is not sold, and I think Tesla will still hold it in the long term.