If you can read the screenshot above, it is from this link at docs.oracle.com It applies to any licensed version of SE2 (Standard Edition 2) or Enterprise Edition database that is capable of the "Multitenant Architecture".
Previous to this licensing condition change, you were only permitted a single user defined Pluggable Database (PDB) in addition to the root container. If you have more than one user defined PDB required the "Multitenancy" database option to be licensed.
Oracle has now relaxed that condition to allow a maximum of 3 PDBs per root container without being required to license the Multitenancy database option.
DBAs rejoice !!
Why has Oracle given this gracious concession ? Some argue it is due to no-one using it because of the associated fees. Even if that is true, it is now a good time to explore how a PDB enabled architecture of your database could lower your costs and ease the management of multiple databases. Contact us if you want to learn more.
In regards to Oracle's auditing of database usage, the audit script output will probably remain the same until they release new audit scripts. The current release of the audit scripts (19.1) will report an exception to be investigated when there is more than one PDB. You can ignore that if you have 2 or 3 user defined PDBs and no multitenancy database option licensed. Hopefully the LMS team in Hong Kong & Romania that examine your audit script results will be aware of the new changes too !