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It is much more feasible for Jeff Bezos to sell a billion dollars worth of Amazon tomorrow or Bill Gates to sell a billion dollars worth of MSFT tomorrow than it is for Elon to sell a trillion dollars of SPCX even over a year's time

I get that net worth is more than just cash, and that is not what I meant and it's pretty obvious that isn't what I meant. It may not just be cash on hand but if an asset is completely illiquid at it's purported value, is it actually worth that?

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It is, because of the time component of money. Money is a way of storing the value of labor in a manner less affected by time. If you sell it all at once, its value is greatly reduced. All investments include that time component. Point-in-time net worth doesn't have much value as a measurement in part because of this.