Haven't watched the video yet,so maybe this idea isn't new, but the topic is intriguing.
The singularity will arrive the moment that it takes an entire human lifetime to learn enough background knowledge to advance.
Right now, as time goes on, it takes more and more schooling to get up to speed, for lack of better term. Like, you're not going to be making easy new discoveries, because first you need to spend 18-20 years in school learning what everyone else discovered before you, so you can build on it.
What if it takes 70 years to get up to speed on human knowledge?
Sure, there are some possibility for abstraction, analogous to a physicist knowing zero biology and just relying on biologists to figure out the details of the black box the physicist uses, but eventually that will run out too.