In the Ansible-lint documentation page about yamllint-configuration
https://ansible.readthedocs.io/projects/lint/rules/yaml/#yamllint-configuration

It says on the octal-values options that # yamllint defaults to false
This does not appear to be an accurate statement based on the yamllint documentation site
https://yamllint.readthedocs.io/en/stable/rules.html#module-yamllint.rules.octal_values

This states that the default values for forbid-implicit-octal and forbid-explicit-octal are both true already, but only when the octal-values rule is enabled.

So at a minimum, the comments that are inaccurate about what the defaults are should be removed, and since the defaults already are true, the forbid-*-octal are unnecessary, as just enabling the octal-values rule is enough. (Although being explicit about the setting being true is acceptable)