User has more privileges in redshift than shown by relevant query

Working in Redshift

dev=# SELECT table_catalog, table_schema, table_name, privilege_type
FROM   information_schema.table_privileges
WHERE  grantee = 'myser';
 table_catalog | table_schema | table_name | privilege_type
---------------+--------------+------------+----------------
(0 rows)

However the user is able to perform select on several randomly tested pg_catalog schema tables, e.g. SELECT * FROM pg_class_info;, SELECT * FROM pg_class; etc. The only GRANT command I run after creating myser was:

GRANT SELECT ON stl_connection_log  TO myuser;

after setting

SET search_path TO pg_catalog;

what am I missing?