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The shots show that whatever cutting disk they used gets part of the way through the ceramic spheres.
My guess is that there will be a type of blade/disk that doesn't get blunted as quickly, and so it just chews through it.
It might be like the videos manufacturers put out where they claim something is un-chop/cut-able by using inappropriate tools or inappropriate usage.
I'd like to see someone like the lock picking lawyer have a go (where he's cut through previously "uncuttable" things just by using the right tools/techniques).
Expected this to be marketing nonsense (it still might be) but it actually looks really interesting!