SpaceX paid that $60 billion entirely in stock. In other words, they traded 2% of their own inflated stock value, for 100% of Cursor's inflated stock value. This is actually a great deal for SpaceX.
If they had paid $60 billion dollars in cash for Cursor, it would have been a ripoff.
You can't sell 60b worth of stock without moving the price. It has to be dribbled out over time.
Some buyees of course insist on cash. Which moves the effect of stock sales onto the buyer. Most buyers would prefer to pay in stock as it doesn't impact cash flow at all.
So, a all-stock deal already has the future-price of the stock built in. Which probably (but not necessarily) inflates the headline number.
In other words, let's say I offer you 60b stock[1], or 30b cash. Which would you take? If you're risk adverse, take 30b cash. You can buy a nice diversified portfolio with that.
If you're confident SpaceX will be around say 10 years from now, and still worth good money, then take the 60b and sell it slowly over a long time. It's a big bet though (if SpaceX goes into liquidation, all stock immediately goes to 0.) Of course if you think the price will ultimately go up, then it's a good choice as well.
[1] there are likely some boundaries which dictate when you can start selling the stock.
If they had paid $60 billion dollars in cash for Cursor, it would have been a ripoff.