WiFi 6 Operating System

(It's sort of trivia, anyway), can anyone report what software the AX series Orbi is based on?

The RBR50, for example, appears to be built on OpenWRT.  From the debug log:

DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='Chaos Calmer'
DISTRIB_REVISION='r6043'
DISTRIB_CODENAME='chaos_calmer'
DISTRIB_TARGET='ipq806x/generic'
DISTRIB_DESCRIPTION='OpenWrt Chaos Calmer 15.05.1'
DISTRIB_TAINTS='no-all'

I had assumed that the AX product would be "essentially the same", except with new radio drivers. Only.... (this is Netgear, after all)