Exactly! You can run it on any server connecting to any Postgres, without installing custom extensions (AWS Aurora supports only a limited number of extensions https://docs.aws.amazon.com/AmazonRDS/latest/AuroraPostgreSQ...).
The Iceberg tables are created separately from the DuckDB query engine. So you should be able to read these Iceberg tables by using any other Iceberg-compatible tools and services like AWS Athena.