I deem this as just older terminology that has trickled-down from the automated car-wash facilities---tunnel & touchless...
in order to fit some of the marketers/marketing promotional needs.
Promotional needs?
That's where "drying-agents" are applied to vehicles' surfaces, through other means than using the: "drying agent arches".
Those "arches" usually spew out quite different drying-agent formulations, say, than those that you're probably,
out of curiously, referencing in your above query.
"Nothing new under the Sun" is a favorite adage of mine.
Bob