Earlier quoted context omitted.
You seem to be correct. > Google Maps Platform is a part of Google Cloud, but not a part of Google Cloud Platform I have never felt that I have been confused by something so justifiably.
(googler working in gcp here) The basic way to tell if something is part of GCP or another Google product that some marketing whiz managed to have "cloud" tacked onto the name is whether or not you need a GCP project to work with it.
Not true, as far as I know. Many (if not all) Google APIs require a GCP project for access via API key, service account credential, or mobile application.