http://wol.jw.org/en/wol/d/r1/lp-e/2011736
I've not bothered to read anything on this for years as I addressed it personally years ago. But in this official article they appear to be focusing all their argument on the '70 years' part of the debate. There appears to be no mention at all of the small detail of them needing it to be 607 for them to arrive at 1914 for the end of the Gentile Times.
Have they scrapped the 2520 years stuff?