The methodology and conclusions of Naomi Oreskes expressed in the essay you cite have been discredited. Attempts to reproduce her results have failed -- and for a literature search study, that is very surprising.
Here is a good summary of the difficulties with Oreskes' essay.
You may notice that Science declined to publish the letter. This is not because of any covert act by the Science editors, nor rejection of Benny Peiser's claim. Scholarly journals expect to be the original publisher of any work. Peiser's findings had been widely distributed across the Internet, so Science followed its standard policy.