Just what I was thinking!
Thanks for the link, jings. This is the relevant paragraph, I think, and yes he does say that segregated schools (i.e. separate schools for catholics and protestants) are not a good idea, not helpful. The NSS has reported that bit right.
"Because issues like segregated schools and housing, lack of jobs and opportunity -- symbols of history that are a source of pride for some and pain for others -- these are not tangential to peace; they’re essential to it. If towns remain divided -- if Catholics have their schools and buildings, and Protestants have theirs -- if we can’t see ourselves in one another, if fear or resentment are allowed to harden, that encourages division. It discourages cooperation."