There is no such thing as a $200B private market valuation. For a company to have that large of a valuation, it pretty much has to be a publicly-traded company by definition.
If the argument is that somebody bought 0.001% of the company for $2,000,000, therefore 100% of the company is worth $200B, that's just a bridge too far.
If the argument is that somebody bought 0.001% of the company for $2,000,000, therefore 100% of the company is worth $200B, that's just a bridge too far.