Musk made the offer just before a big drop in valuation of tech companies. Even if Twitter revenue remained stable it probably wouldn’t be worth $44B Musk paid.
With a drop in usage, drop in ads, controversy around the bots, misinformation, failure of Twitter Blue, I would expect that the actual value is quite below the said $19B.
Maybe the cost saving measures partially offset the drop in revenue? They crippled functionality for guest users quite a lot (I’m not logged in on my work laptop and I can’t see quote tweets nor replies), their workforce is 5x smaller, it seems their costs are way lower than before.