What do you mean? Google bought SpaceX shares when it was a tiny startup. They are probably more than 100X on their initial investment. Even with a 99% drop in SpaceX stock, Google would still be positive.
Edit. Google invested 900 million in 2015 for roughly 5% of the company which comes out to 71.5 Billion dollars at 1.45 Trillion dollar current valuation. That's an 80x increase.
I think Larry Page individually might also have a very large stake as well.
It doesn’t matter what price they bought SpaceX stock for. They could have gotten it for free. Any gain prior to Google’s investment could be realized prior to Google giving SpaceX even more money. What matters is the return on investment for the $12B/year into SpaceX.
In order get that back by “pumping” SpaceX stock, SpaceX market cap would have had to increase $200B based on that investment, and then Google would need to sell the stock.