Verbatim? Really? Radio Hanoi broadcast Chomsky in English although hardly anyone North Vietnam spoke English? Why then would the transcript (as opposed to translation) have come from the U.S. government? Is it inconceivable that the Hanoi government took certain liberties with the speech when it came to praising the Hanoi regime, which elsewhere Chomsky has criticized?
Chomsky's reply: "I know nothing of any speech broadcast on North Vietnamese radio 30 years ago, or ever." He admits that portions of the speech are similar to things he was writing at the time, but most of those that have read most of his work believe that it doesn't "sound" like what he usually says (it's too effusive, for one, and he's usually detached and sardonic; and he's a bitter foe of Marxism-Leninism and state or non-libertarian socialism).
http://www.isp.nwu.edu/~fprefect/politics/chomsky.html
So where has he "loosely admitted" it? Never mind. Let's just point out that in order to attack someone who's published hundreds of articles, speeches and books about US foreign policy, they have to hang their hat on an "official" transcription of a foreign speech given 30 years ago that no one can remember him giving. How very persuasive.