That's easy. The CEO has authority and social connections, has done mutual beneficial deals, has the soft skills/position to command authority over others, has leverage over others, etc which is an economic asset. In an AI world this skill comparatively is MORE scarce than intelligence based skills (e.g. coding, math, physics, etc) and so will attract a greater premium. Nepotism and other economic advantages will play a bigger world in a AI world.

AI rewards the skills it does not disrupt. Trades, sales people, deal makers, hustlers, etc will do well in the future at least relatively to knowledge workers and academics. There will be the disruptors that get rich for sure (e.g. AI developers) for a period of time until they too make themselves redundant, but on average their wealth gain is more than dwarfed by the whole industry's decline.

Another case of tech workers equating worth to effort and output; when really in our capitalistic system worth is correlated to scarcity. How hard you work/produce has little to do with who gets the wealth.