Well I guess the problem is, that this a lawsuit by farmers. If I am not wrong, the studies usually come to conclusion, that within the allowed parameters it does not cause cancer, so they use this result as the prove that it is not carcinogenic.
Farmers however are probably exposed to higher amounts and then there is the problem, that it does cause cancer, as the IARC concluded for example. So this could be a problem for them and specifically them, which does make the whole thing a lot more complicated.
But I have not read everything about this case.