It's a win with but caveats, the guidance was withdrawn and the DPP agreeded to update it after SM started their action (a win), the DPP claimed SM didn't have legal standing to bring the action, the DPP were wrong (a win). The court might have ruled that the guidance wasn't unlawful, but its verdict will prevent the DPP from bringing the guidance back in its original form, so the amendments stay (a win).
I found this particularly insightful of the court "It said that the CPS should remember that this document is not intended to be an equalities policy.
So all those organisations that keep hiding their misogynist policies behind claims of equality, values, inclusive blah, blah, blah take note.
Those who can't/won't see this is mostly a win aren't looking at it with unbiased eyes.