Aren't they beholden to investors already? Why would an IPO make a big difference?
In any case, if they need to IPO in order to survive as a company, then bringing in regulators to act as a counterweight against commercial pressures makes a lot of sense to me.
If anything, his entire argument leads to the eventual premise that AI labs need to nationalize.
He is already arguing that commercial competition creates dangerous incentives, and that labs cannot slow down because competitors may overtake them. He also asks for what would boil down to significant government intervention to preserve a Western lead.
If this is true, why preserve the commercial incentive? The U.S. government would already have the necessary goal of remaining ahead of China and other competitors. Why not remove entirely domestic race for market share, valuation, and investor returns rather than keeping private labs in competition and then asking regulators to counterbalance the incentives that competition creates.
That doesn't mean nationalization would be better, but given the severity of the risks he describes to national security, it seems like an obvious conclusion that nationalization is the eventual end result of the argument.