The example is misleading given the default decoding plugin is `decoderbufs` where I can find no documented reference for `add-tables`, only `debug-mode`, and that's purely found in examples and the plugin's codebase.

Best to use an example that relates to the default plugin at least, or include a couple of examples across different plugins.

Worth noting that if `pgoutput` was the default, parameters for `pgoutput` are dependent on the `proto_version` specified when creating the slot. However, auto-creation of slots by the Connector is hardcoded to `proto_version=1` (See linked ticket for details).