So am I. Sorry. I went back to get that screen grab. The payment plan was selected by default. I saw nothing about adding the access fee monthly like in your picture. I was already month to month and paying the $20 fee per month, including my paid-off, not from VZW Nexus 6p and my wife's new, on-payments S7.
Worse case scenario, I'll keep an eye on my plan on the VZW site and My Verizon app. So far, it's still showing $20 line access fee for each of my lines.
14 day return policy, so if I notice the monthly payment get jacked up, I can return it within the window and think I should be safe to assume my line access fee will go back to $20 because it's supposed to be based on device.