Yes, Craig did say he would keep the “BBC War Porn” page open permanently for comments; however, the page settings weren’t changed from the default timeout (which closes the thread 8 days after the last comment). The last comment was on 24 July, so the thread closed on 01 August. Clearly interest waned and commenters moved on.
I’ve reopened the thread and set a longer timeout to see whether interest picks up. Unfortunately, we know from experience with other perpetual threads that leaving them open permanently tends to invite accelerating quantities of spam, causing a nuisance for the moderators who have to wade through multiple screens in the spam list to check whether any genuine comments were caught in error.
We’ll see how it goes.