“That’s according to a Monday report from The Wall Street Journal. Given Musk purchased Twitter for $44 billion late last year, the markdown would put the company’s current valuation at about $23 billion, based on Ark’s estimate.”
$23b is what it was actually valued before Musk crazily overpaid for it and took over.
Now, that estimate comes from an investor that financed part of that purchase (so they’re already suspect for paying double the odds back then) that still thinks there’s a great future ahead for Twitter under Musk - so it’s wildly optimistic.
The real value you could find someone paying for it would be more likely in the mid single digits.