It's a good point. I didn't think of that.
It seems FB-I used ~14k visas per
DoS visa statistics (a little under 7% of 226k FB visas, which is a bit surprising?) out of which some 13k were CP FB. I don't know how many FB were used by India this FY before the EO went in effect, but assuming CP FB is blocked for the rest the FY, then I think you are right that those should be available to EB-I AoS candidates unless there are FB-I AoS candidates in the US with later PDs who can pick up the slack from FB-I CP.