Not trying to be contentious, it just looks odd to me. Might be perfectly true - and I'll believe it when I see it. Nothing to do with you, Yamadog, as far as I can tell, you're just passing along some information you saw on another forum.
The post appears to be a letter from Purolator to a person writing them about this design change. I can't find any actual Purolator tech/spec info about this design change anywhere else I looked, doesn't mean it doesn't exist, just that I can't find it. Yet. I learned a long time ago to look a bit askance at posts on forums as "facts" without at least a cursory backcheck - and in this case, I can't find any supporting documentation.
Sometimes something that initially looks odd turns out to be true, and sometimes not.