It's good to have as reference to give to those who get confused with the results they get from their test equipment.
What I note in Step 3 of the section titled "Installation Instructions" is an un-ambiguous requirement to always connect the Branch Circuit Neutral Conductor to the BR AFCI Load Neutral Terminal Screw.
This is more restrictive than the GE Installation Instructions.
Older documents have included a line drawing of the breaker with conductors passing in, through and out of it, that includes an Oval surrounding both the Branch Circuit HOT and NEUTRAL, implying, to me, the presence of a toroid. The oval, however, wasn't annotated in the Eaton documents.
I suspect that signals in the current and voltage on the Branch Circuit Load Neutral are necessary for the Eaton proprietary circuitry and assembly to pass UL test to be a combination type AFCI. Just my opinion.