Customise Or Override Project-specific Kedro Commands

I am looking at this example: https://docs.kedro.org/en/stable/development/commands_reference.html#customise-or-override-project-specific-kedro-commands

"""Command line tools for manipulating a Kedro project.
Intended to be invoked via `kedro`."""
import click
from kedro.framework.cli.project import (
    ASYNC_ARG_HELP,
    CONFIG_FILE_HELP,
    CONF_SOURCE_HELP,
    FROM_INPUTS_HELP,
    FROM_NODES_HELP,
    LOAD_VERSION_HELP,
    NODE_ARG_HELP,
    PARAMS_ARG_HELP,
    PIPELINE_ARG_HELP,
    RUNNER_ARG_HELP,
    TAG_ARG_HELP,
    TO_NODES_HELP,
    TO_OUTPUTS_HELP,
)
from kedro.framework.cli.utils import (
    CONTEXT_SETTINGS,
    _config_file_callback,
    _split_params,
    _split_load_versions,
    env_option,
    split_string,
    split_node_names,
)
from kedro.framework.session import KedroSession
from kedro.utils import load_obj


@click.group(context_settings=CONTEXT_SETTINGS, name=__file__)
def cli():
    """Command line tools for manipulating a Kedro project."""


@cli.command()
@click.option(
    "--from-inputs", type=str, default="", help=FROM_INPUTS_HELP, callback=split_string
)
@click.option(
    "--to-outputs", type=str, default="", help=TO_OUTPUTS_HELP, callback=split_string
)
@click.option(
    "--from-nodes", type=str, default="", help=FROM_NODES_HELP, callback=split_node_names
)
@click.option(
    "--to-nodes", type=str, default="", help=TO_NODES_HELP, callback=split_node_names
)
@click.option("--nodes", "-n", "node_names", type=str, multiple=True, help=NODE_ARG_HELP)
@click.option(
    "--runner", "-r", type=str, default=None, multiple=False, help=RUNNER_ARG_HELP
)
@click.option("--async", "is_async", is_flag=True, multiple=False, help=ASYNC_ARG_HELP)
@env_option
@click.option("--tags", "-t", type=str, multiple=True, help=TAG_ARG_HELP)
@click.option(
    "--load-versions",
    "-lv",
    type=str,
    multiple=True,
    help=LOAD_VERSION_HELP,
    callback=_split_load_versions,
)
@click.option("--pipeline", "-p", type=str, default=None, help=PIPELINE_ARG_HELP)
@click.option(
    "--config",
    "-c",
    type=click.Path(exists=True, dir_okay=False, resolve_path=True),
    help=CONFIG_FILE_HELP,
    callback=_config_file_callback,
)
@click.option(
    "--conf-source",
    type=click.Path(exists=True, file_okay=False, resolve_path=True),
    help=CONF_SOURCE_HELP,
)
@click.option(
    "--params",
    type=click.UNPROCESSED,
    default="",
    help=PARAMS_ARG_HELP,
    callback=_split_params,
)
def run(
    tags,
    env,
    runner,
    is_async,
    node_names,
    to_nodes,
    from_nodes,
    from_inputs,
    to_outputs,
    load_versions,
    pipeline,
    config,
    conf_source,
    params,
):
    """Run the pipeline."""

    runner = load_obj(runner or "SequentialRunner", "kedro.runner")
    tags = tuple(tags)
    node_names = tuple(node_names)

    with KedroSession.create(
        env=env, conf_source=conf_source, extra_params=params
    ) as session:
        session.run(
            tags=tags,
            runner=runner(is_async=is_async),
            node_names=node_names,
            from_nodes=from_nodes,
            to_nodes=to_nodes,
            from_inputs=from_inputs,
            to_outputs=to_outputs,
            load_versions=load_versions,
            pipeline_name=pipeline,
        )

Generally in Python users are supposed to stay away from single underscore prefixed variables, however this example in the docs illustrates using them. When functions like _config_file_callback appear in user documentation for constructing examples it makes it less clear what is intended for end-users.

Are such methods / functions supposed to be part of the public API?