What PUBLIC access means on tables in Oracle?
Grants and Revokes of Privileges to and from the PUBLIC Role


  You can grant and revoke privileges and roles from the role PUBLIC.
  
  Because PUBLIC is accessible to every database user, all privileges
  and roles granted to PUBLIC are accessible to every database user. By
  default, PUBLIC does not have privileges granted to it.
  
  Security administrators and database users should grant a privilege or
  role to PUBLIC only if every database user requires the privilege or
  role. This recommendation reinforces the general rule that, at any
  given time, each database user should have only the privileges
  required to accomplish the current group tasks successfully.
  
  Revoking a privilege from the PUBLIC role can cause significant
  cascading effects. If any privilege related to a DML operation is
  revoked from PUBLIC (for example, SELECT ANY TABLE or UPDATE ON emp),
  then all procedures in the database, including functions and packages,
  must be reauthorized before they can be used again. Therefore, be
  careful when you grant and revoke DML-related privileges to or from
  PUBLIC.


If you do not use the above packages, it will not have any impact on your application.