I didn't watch the entire thing, but, it looks like you still have to come up with your own homegrown logic for precisely when to tell the progress bar what to show. In other words, you still have to have, (ideally), a loop with a known # of iterations, and a known % complete proportion.
Which would mean that (although I agree, the visual is nice - the style of dots is a cool look for sure), it's not any advantage over the homegrown ones I've used.
The real magic would come if there was a progress bar that magically knew how much of a process was finished, with no judgment calls on the programmer's part. That would be gold. But judging from Microsoft's dismal attempt to show progress bars during everyday activities, it seems that will never materialize.
I humbly agree/admit - I never knew about that progress bar control!