There's a lot to unpack here, but a few thoughts. SpaceX wasn't added to the Nasdaq until two days ago, which is right around the time the stock was reaching it's current lows. Doesn't make sense to say that they prices exploded because of that.
Second, I don't know the details but it's extremely unlikely that most SpaceX folks have been able to sell any shares. Typically there's a 90–180 restricted window where pre-IPO holders are not allowed to sell.
The limited float could theoretically drive up, but as I noted, it wasn't added to the Nasdaq 100 until two days ago, so it's not something we can really attribute to that.
Btw, I loathe Elon Musk as a human, but am just clarifying some facts.