When AI exceeds human intelligence, AI is still a machine because we understand its entire structure, and we know every circuit of every chip. So it is a white box. The human brain is still a black box, the black box is free, the white box is not free, the white box is a machine, the black box is not a machine.

In fact, when people and AI develop to a certain degree in the future, the human brain will be fully understood. It will no longer be a black box, and people will become machines. Man has never been born with superiority and sacredness. Man's sacredness is self-proclaimed and irrational. It is caused by man's limited understanding.

Reference

1.Hugo de Garis(2007). The Artilect War: Cosmists vs. Terrans: A Bitter Controversy Concerning Whether Humanity Should Build Godlike Massively Intelligent Machines. Transtated by Hu Jing. Beijing: Tsinghua University Press, p.52-73.(In Chinese)