Yes i saw that noise rating too, mind you the tread pattern looks pretty aggressive so possibly are loud, according to the specs they come with 9.9mm new tread which is better than some alternatives and may account for some of the noise.
As for ratings, my few excursions and experiments on Chinese tyres haven't exactly been inspiring on the whole, found them unpredictable in the wet especially after a year or so fitted (no visible wear), yet in many cases they have marvellous wet grip ratings for tyres around half the price of good makes that can't get near the scores, i'm more inclined to believe the self submitted ratings from well known long established makers than the others, you don't normally get A/B/C rated wet grip and B/C rated fuel economy on the same premium tyres yet some of the cheap makes apparently manage to do it all...this becomes more apparent when choosing car tyres.