Most manufacturers offer their carbon frames in a number of tier levels and the weight difference between their lightest and heaviest is pretty marginal. eg Canyon Aeroad CFR 915g, SLX 990g, SL 996g. So here you save less than 100g on the all-singing-and-dancing CFR frame. Of course the CFR will be much stiffer too, but that’s irrelevant to the weight discussion.

The Aethos S-works frame is 585g vs 699g for the cheaper Comp version. So again around 100g difference and comparing it with the Tarmac frame weights of 800g and 920g for S-works and standard frames gives you an idea of the aero weight penalty ie around 200g.

Your claim that they are using lower grade carbon today is totally unfounded. But even if they were it wouldn’t even begin to account for an overall bike weight difference of 2kg+