The link you refer to is about KB4338814 which was published in the GSF pretty timely:
https://secinfo.greenbone.net/omp?token=guest&cmd=get_info&info_type=nvt&filter=KB4338814
The coverage of GCF is not the same as the one of GSF. See also this topic:
About the Feed Services (GCF & GSF) category
However, this particular NVT is published to the GCF and you should find it in your SecInfo NVT section.
Oracle vulnerability tests are usually published to GSF only.
If you like to discuss about single Vulnerabilities / NVTs, please open a topic in the category “Vulnerability Tests”.