Sounds like the CMA left the door open for behavioral remedies as long as Microsoft can prove or convince the CMA that:
1) Divesture/prohibition would be more costly than the adverse effects of Any SLC. I could see Microsoft arguing this point for divesture, but the CMA could just say "prohibition it is then".
2) The SLC is expected to be of a short duration. Microsoft could go this route too, arguing that Sony could come up with a CoD competitor in the proposed 10 years. Though everything in the industry points to CoD mmaintainingit's dominance and importance. I don't see the CMA going for this either.
3) If there are benefits to this deal that would be undone by structural remedies/divestment. This is Microsoft's golden ticket it seems. Activision currently isn't releasing on Nintendo nor Nvidia, they aren't releasing day 1 on any sub service. Divesting Activision would undo those customer benefits. Though the CMA has said they don't believe Microsoft could even deliver their promises to Nintendo, so it's still a high wall to climb for Microsoft.
But it's clear that the 10 year deal wasn't assessed before the provisional findings were released, and a behavioral access remedy or any remedy that addresses the SLC would be considered.
Maybe the CMA heard about the 10 year deal, and thought "that alone wouldn't be sufficient", but we don't know why that wouldn't be sufficient. Many think they mean 10 years is too short, but perhaps the CMA was weary of Microsoft's ability to fuck with parity, or the fact that a contract with Sony and Nintendo doesn't address their concerns with cloud gaming. Microsoft can and seemly has/is addressing other possible concerns.
All this to say, I think there's a non-zero chance this deal passes with strict behavioral remedies that basically equates to a "10 year deal".