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Sounds more like a finishing stone now. ;)

It's a relative expression. It just means there are polishers that cut fast for there fineness. They are still polishers & by definition still slow compared to coarser stones.

To use an...

I didn't say that. There are fast, fine hard stones but they aren't reasonably priced.

From the video it looks like a nice medium hard pre-polisher. I don't say that to be derogatory as you can...

Medium hard, ultra fast stones are rarely superfine & rarely reasonably priced. If you've lucked out like that I'd buy a lotto ticket.