I'm saying that:
If the availibility of [Game X of Publisher X] on [Console maker, competitor and Publisher Y] has been availible on said [Console Y] is deemed essential input, and blocking that essential input on [Console Y] to hurt [cometing publisher X] will lead to SLC and foreclosure of [publisher Y], then it can absolutely be blocked by regulators. It's the exact opposite arguement of what CMA is making. That does not mean that I agree that CoD is essential input, that's dumb.
You're arguing that Sony can always block games regardless, I'm arguing that Sony can block games, unless.
So yeah, they can absolutely force availibility, especially given Sony is market leader by far.