In addition to the other record on the label having an LA address, I suspect John is getting his information about the writer, Ronald Davis, from the BMI repertoire which confusingly has the Correc-tone writer, a Philadelphia based writer/performer, and what I assume is a third LA-based writer all under the same Ronald Davis profile.
BMI repertoire: Ronald Davis
The Philadelphia-based Ronald Davis has a profile on ReverbNation that states his first recording studio experience was at Sigma Sound in Philly, which wasn't founded until 1968 - same year as the Locations 45, and multiple years after the Detroit records. You can cross-reference the songs listed on RN with the titles on the BMI repertoire. Ronald Davis ReverbNation Profile
Aside from all of that, it doesn't look or sound like a Detroit record to me.