Suskind's (Unacknowledged) Error?

In his new book he claims that U.S. intel warned the Brits about one of the London bombers back in 2003.  The claim, as can be expected, made frontpage news in Britain.

It also appears to be poppycock: Suskind seems to have confused the bomber with a now-jailed jihadist who has a similar name.  It's an understandable mistake. What got my attention is that, though the evidence seems darn heavily weighted against him,  Suskind is refusing to entertain the possibility that he's wrong.