You can see studies which cite that study (which would include debunkings) by doing a google scholar search: http://scholar.google.com/scholar?cites=3661119272352849363&...

One of the those studies has this to say about the study linked by the OP: "Weaknesses in the statistical methods used for reanalysis (see Doull et al. . .) " [1].

That paper also has a nice summary of other studies on GM foods.

[1] G. Flachowsky and C. Wenk, The role of animal feeding trials for the nutritionaland safety assessment of feeds from genetically modified plants – Present stage and future challenges, Journal of Animal and Feed Sciences, 19, 2010, 149–170