Hello, please do not change "street:old_name" to "old_name." street:name refers to the name of an associated street of, say, a sidewalk. According to old maps of the area, the associated street was part of Brandywine Way. However, you tagged the footpath as "old_name=Brandywine Way," which is incorrect. See https://osm.wiki/key:street:name for more information.
So, then, with the street itself being tagged as "old_name=Brandywine Way," a natural extension/interpolation would be to tag the surrounding footpath as "street:old_name." Thanks!

https://www.openstreetmap.org/changeset/173459509