(My apologies for the delayed response--I have been a little busy lately.)
Oh, I see the changes now! I was focusing on a different part of the documentation--there is still one more change needed.
The 'mule' comment should be in the 'P' box rather than the 'no marks' box. The 'P' die was only meant for Plated steel coins (magnetic ones), but this type is for plated zinc ones (non-magnetic ones), hence the mule. The 'no mark' coins, on the other hand, are fairly common and are not mules.