This is a jaw-dropping allegation, here. Mr. Richert added some more information in a comment on my weblog:
As for the 30 Days/Catholic World News question, the issue that Fessio chose not to publish was, I believe, March 2001. (I have all the copies here somewhere, but I haven't looked at them in years.) It featured a cover photo of John Paul II begging for peace and a cover story on his opposition to the war. Father Fessio did deny that this was the only reason he decided to quit publishing the American edition of 30 Days, thus confirming that it was a reason. (Among other reasons he cited was a concern that 30 Days spent too much time talking about Masons, which he regarded as irrelevant to Americans.)
I had made a silly mistake in my comment over at Kevin's blog. This issue was from 1991 (I believe March), not 2001 (obviously). Perhaps I'm in denial about how many years have passed...