The quote does not say that it isn't possible on the PS3. Reading the quote, to me it looks like they say they themselves would not be able to pull it off on the PS3 and that they are better off on the 360. This could be due to the fact that they are able to use the 360 dev tools to more easily get what they want and are better off with that, but it doesn't seem to follow from their statement that what they are doing is actually not possible on the PS3. They may have meant when they said that statement that not only could they not do it but that they doubt any team would be able to pull off their lighting effects, but it is hard to tell from that quote, and in any case, even if they did mean that, it would be interesting to see if other dev teams with stronger PS3 expertise shared that opinion.