You can lose airframe power with the batt/gen on, it's just a circuit going to the FADEC. It also would not be the first time BELL misplaced a "note" in a procedure.
I do understand that you could lose power even with a battery and generator on but for it to lose that power there has to be a reason if a note is added into the RFM. I agree with you that it could be a misplaced note as well but I have heard this in my training and leads me to believe there might be something to it. So it could be one of those things that’s repeated and no one even knows why. I’m still trying to understand RVDT’s comment on the diodes though I lack the intelligence of you guys so it’s difficult for me.