Now that I have investigated more, Brian made a mistake in the title.
The travel speed is 1000mm/s and the printing is actually 600mm/s max

In the video, they clearly print 0.1mm or under, so the filament wouldn't become the bottleneck performance.
I can't talk about the acceleration, since I was never fan of that value.

But then their 600mm/s works only for a specific condition, it's not going to be a general speed.