AC Delco is an aftermarket parts supplier just like Motorcraft is. They are not OEM parts.
Those AC Delco struts will most likely be re-labeled Monroes or similar.
ACDelco has both OE and aftermarket parts in the lineup.
ACDelco GM Original Equipment is the OE line
ACDelco Gold, formerly Professional (amateur), is mid-grade aftermarket parts (Gabriel shocks, Raybestos brake parts, etc)
ACDelco Silver, formerly Advantage (disadvantage), is low-quality scrap you should avoid.
The OE shocks for this car seem to be made by S&T