Honestly, makes sense as the MB-side connector on the old interposer is probably half the BOM cost because it’s a pretty specific part with 78 small pins. And they cannot/don’t want to sell the new version because it won’t be compatible with 7040-series motherboards.
I’m not sure that it won’t be compatible with 7040 boards. That connector it plugs into exists on 7040 boards, whether the pinout is the same will be a question I guess.