Now I'm not a aero guy, just my observations, but did seem interesting with the differences with RB,MCL, WILLIAMS and their similarities of side pod profile.
Since the Canadian upgrade they did say that their WindTunnel and real world data was correlating despite the limited track data and unfavorable weather. I noticed they are trying to get more of an undercut under the sidepod and the changes in the outer profile of the floor is to divert more air above the floor surface.
Additionally the undercut of the sidepod of AMR23 is considerable difference with the RB this image shows justice.
I suppose the sharper angle is to aid flow lateral expansion of the floor through the sides
Just my thoughts and ideas if AMR were to go with a similar design to RB,MCL,WILLIAMS-
What are the chances AMR will be back on top with the other tracks with their current design?