That's what they say at the 9-11 Accountability Page.
As a result of the controversy surrounding Eric D. Williams, he has stepped down from involvement in the 9/11 Accountability Conference. The 911 Accountability Conference does not support Holocaust denial, nor does the 9/11 Truth Movement. No other speaker listed here is known to have published works related to the Holocaust.
They've made a hasty job of taking his name down, but he's still mentioned on the Exhibitor's Page as of 10:00 MST tonight:
There will be room for 32 spaces on a first-come/first-serve basis, consisting of anywhere from one to five 6’ skirted and draped tables with one to two chairs per booth. You will find a copy of the basic floor plan below. Please contact myself, Eric D. Williams, to secure your location. If you prefer a table in the hallway near registration, please contact me.
In fairness I suspect that's just an oversight, although they haven't put together anything on whom to make the checks payable to.
Update: See also the Feathered Bastard, who makes many excellent points:
Williams’ book was poorly written, poorly researched and in much need of a copyeditor to judge by the malapropisms, atrocious grammar, and frequent misspellings. He says the only thing he’s guilty of is “thought crime.” Actually, he’s guilty of something his fellow 9/11 conspiracy theorists are guilty of: Writing about and claiming expertise in a subject they are not qualified to address.
Ultimately, Williams is a coward. It’s obvious from his statement that he still believes that the systematic murder of the Jewish population of Europe under the Nazi regime did not take place. So why pull your book, Eric, when you still believe in what you wrote? Why not have the courage of your unsavory opinions? This is what annoys me about his ilk. Hit them with opposition, and they run and hide. At least until no one is looking at them any more.