It was from here. Quite a way down the page
https://www.bicycling.com/bikes-gear/a26150279/sram-red-etap-axs-review/
DC Rainmaker article has the skinny - the take is that because the chainrings cost £300 paying £400 to swap the PM spider and rings is OK.
Erm
@Howard started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
It was from here. Quite a way down the page
https://www.bicycling.com/bikes-gear/a26150279/sram-red-etap-axs-review/