I now see that you're right. I was looking at old OS maps. I'm not a railway history buff.
I'm not the person who originally posted about this curve but I supported him in #108 - wrongly, I now see.
A line turned north off the Warrington Central line just before (going west) the bridge over Froghall Lane. It crossed Froghall Lane by a separate bridge of its own which apparently still exists (according to Google satellite view) but carries no track today. It went through what is now Dalewood Close and the west end of Eustace Street where there are relatively new houses.
I took it for a link to the WCML but, looking more closely at the maps I consulted on
www.old-maps.co.uk , it remained separate from the WCML, went under Bewsey Road going parallel to the WCML, and ended at Dallam and Bewsey forges (what is shown there depends on what date map you look at).