Well said.
He could educate himself properly on this in about 2 hours and the cost of the hardware setup is ~0.25% of his stack - 2 hours and a fraction spent to protect that much wealth is a minuscule investment versus entrusting a third party in an industry rife with fraud and corruption.
One of the biggest mistakes people make is completely fucking up their threat modelling. Like goldbugs refusing Bitcoin because of the threat of an EMP wiping out electronics worldwide, or Climate Cultists believing the world is going to end whilst ignoring how impossible it’s going to be to live in the economy their ideology will bring about.
Get your threat modelling right people!!