Note that this is probably a terrible strategy here, though. The most likely effect of adding SpaceX to the index in the manner described is that the price of SpaceX is likely to go artificially high as the index funds fight for the very few available shares.
If you are actually going to do this, you'd probably want to sell out of the ETF before it's added, wait for SpaceX to be fully added to all the index funds, and only then simultaneously buy into the ETF and short SpaceX.
You would think even the lowest paid employees performing routine labor at the company would be pulling in multiple 6-figure salaries. I wonder if that's the case?
Why would you think that? Because of Musk's reputation for magnificence and generosity? Because rich gigantic companies don't care about keeping operating costs low? Or because janitors at SpaceX require special skills that can only be obtained by paying many multiples of the market rates for standard janitors?