I build boat windshields for a living and we buff out small scratches with Cerium Oxide and a felt pad all the time. It does work, but they can't be too deep and you need to keep it clean. The kit shown probably has Cerium Oxide in the bottle.
I have use the 3M product as well and it works on the same principle as buffing Acrylic. Start with coarse sanding and work your way up to Cerium Oxide. Like acrylic it takes time to get a good job.
Raf said his scratch is to deep anyway but as to whether it is possible it is. 
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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