The replica identity of a given table is not a property of publication, per say, so it's arguable whether it should be included in pg_publication_tables or not. But the output seems to be useful. E.g. from the tests
To my understanding, pg_publication_tables doesn’t just contain publication properties, but also information about the tables included in the publication. As long as the exposed information about the published tables is relevant in the context of publications in logical replication, I think it’s reasonable to include it in pg_publication_tables. IMHO replica identity seems like relevant information.
