Yes, but how much? Most of the rich pay taxes, but how much "should" they pay? Should someone worth 100M pay higher income taxes than someone worth 1M if they make the same income in a given year? Should there be a "limit" on the amount of wealth one can transfer in a given year as which point taxes hit 100%?
Tax schemes and how they affect wealth, inequality, consumption, etc. is an interesting line of thought, and a necessary one, if you accept that the current one has allowed some individuals to get so rich that the rule of law breaks down in their presence.
It’ll entirely be long term gains, so I wouldn’t say huge as a percentage. I would also venture all kinds of other things are being written off to reduce the tax burdens. Typically people like Musk don’t sell stock but use it as collateral to take out low interest loans, which avoids taxes.