Solving the ext3 latency problem

Actually, maybe not. This is not about security; as far as security goes ext4 is the same. What he is saying (or what I understand him to be saying) is that in ext4, due to delayed allocation, the performance issue with data=ordered is alleviated.

So I'd see this as "delayed allocation makes ordered almost as efficient as writeback", not "...makes writeback as secure as ordered"