You don't need paper in your foil packet with a knife blade. Perhaps a big irregular shaped object will have enough air in there that you need something to reduce oxygen but knives don't need it.
I think the foil (which heats up faster than the work inside of it) has something in the alloy (titanium perhaps?) that reacts with oxygen for you and makes the paper moot. I'll bet it used to serve a purpose, and it still may with some large parts, but Lorien shouldn't need it.
I'll get some rainbow discoloration and sometimes a bit of scale if there's any little hole or leak, but paper also leaves crap burnt onto the blade and it can poof out your package as it outgasses perhaps causing a leak. In my opinion paper falls somewhere between pointless and somewhat harmful.
I have tested Lorien's knives here. I got HRC 59.0 for the small one and 59.5 for the chopper. The HT is probably about right, there's nothing I would suggest he change.