I think Putin means that it is impossible to sift through all this data and make sense of it. As someone once said, data is not information and information is not wisdom. To see what he means, Google on your last name and see if the results make sense. Not some of the results that you pick and choose, but all of the results.
That's the part I disagree with. Given sufficient resources, that huge miasma of meta data out there could be sorted and cross-referenced in all sorts of ways. Sense can be made out of it. Sure, in the end that analysis is subject to human review, with its frailties, but the data itself can be worked with, because we do have the resources. The Russians probably don't, but who knows?