SpaceX made fast index inclusion a condition of where it listed. Nasdaq changed its index rules so that instead of having to wait months to a year, SpaceX can enter an index after 15 trading days.
Index funds track an index mechanically. If you run an S&P 500 fund, you have to mirror the S&P 500. If a company gets added to the index, every fund tracking the index must buy it to match the index -- there is no discretion. Pension funds hold a lot of index funds.
So the causal chain is that pension funds track indexes, indexes have to buy the companies in the index, SpaceX got a fast path to the indexes. SpaceX will launch and pension funds will buy the stock, presumably propping up the stock price.
It would take a lot for pension funds to undo this and would be the opposite of index investing.
https://ai.meta.com/blog/introducing-muse-spark-msl/