People talk a lot about AGI/ASI these days, artificial general intelligence and artificial super intelligence, the strong AI, with different definitions and time estimations when we will reach such a level, but, the actual point in TS takeoff is the feedback loop, when the system starts to feed its own development in an feedback loop and exceeds human understanding. As mentioned, we already have a human <-> computer feedback loop, better computers help us humans to build better computers, but I am still waiting/observing for the direct link, AI builds better AI, computers build better computers, the AI autopoiesis.

https://en.wikipedia.org/wiki/Autopoiesis