You're refuting the wrong point here. It's not that business involves no skill. It's that the difference between competitors can be due to random chance.

Two people could have equal ability to make decisions - some good, some bad. In some fields of endeavor, they might succeed about equally.

But in startupland, it's easy for one wrong decision to kill the business, so they are removed from ever trying again. Or one right decision could cause them to experience accelerating returns – which compensates for all the other dumb mistakes, and eventually kills off their competitors.

So, paradoxically, the more cutthroat the environment, and the more exponential the possible returns, the less we can use survivorship as evidence of superior skill.

Note that I'm not saying a successful businessperson is unskilled. It's just that it's not conclusive evidence of superior skills.