My brain is moving slow this morning. But it sounds like an argument that wealthy people should stop hoarding wealth and allow more equitable distribution because they'll be better off. But they already have all the wealth in the current system, so you're not incentivizing them to change their patterns.

If you're arguing for a new system that doesn't allow the amassing of wealth by a small percentage of people, you're going to have an uphill battle because money = speech and thus, those with the money have more rights to decide how the system works.

There are a few problems they skipped.
First, that bigger pie is still finite, but we act as if it's infinite, pretending that one person having billions doesn't adversely effect others, but that's simply not true.
Second, it overlooked the fact that those countries going through industrial revolution often do so by using other non industrial countries resources, making it impossible to industrialize everywhere....we would need at least one more planet to harvest.
Third, it never pointed out that the GDP increases caused by industrial revolutions were met with massive increases in population, which decreases the per capita net worth significantly. Doubling GDP while tripling population makes the average person have less, not more.

I'm disappointed they didn't mention the French revolution, caused largely by the wealth disparity they're discussing.
Jean-Jacques Rousseau: When the people shall have nothing more to eat, they will eat the rich.

This video seems to be a long winded version of 'a rising tide lifts all boats'.