Right. A secondary bevel. I believe that his investigations are what led Zowada to use tape to create a secondary bevel on his razors.
I just looked up the Feather site. It is actually a TRIPLE bevel!
Interesting info you've found there! I think you're right in that his angle isn't including the ~1 micron microbevel.
Wrt. your earlier mention of Tim Zowada using a laser to determine the final bevel angle - do you have a link to that? When I go to his site, it looks like the navbar links to technical stuff got lost in a site redesign.
Here's another one they showed us. $6 US plus ship. I will post links when they are available View attachment 656637
I can't see it too clearly, but it kind of looks like they've cleaned up the heel a bit here by introducing a radius that removes some of the stabilizer.