having watched the video, I actually don't think I can agree with the last point of the clip (perhaps it was bad editing).
The speaker said that it the best learning only happens in groups, and that therefore assessment must be done that way as well.
In every instance I can think of (for me personally) the best learning always happened in strict isolation.
Other people are very often a great distraction, most obviously when they aren't on the same academic timetable. Meaning if they would rather be wasting time, when you wish to be spending it.
I am not saying group work isn't important, and it is of course an essential part of one's education.
I just think the author greatly overstates the position.
and it seems to fit nicely with some of the ideas that have popped up in this thread ...