"Use authorial modesty" outside of extensions

In the recent bug report here, it was pointed out that writing “Use authorial modesty.” outside of an extension leads to Inform 6 errors. The consensus in the notes to the issue seems to be that this use option should do nothing in this context, but WI 27.6 says otherwise:

Am I misreading this somehow? If not, I can’t seem to reopen the issue on Mantis since I didn’t submit it originally, but maybe a developer can.

I never caught that paragraph. It may be new.

Can you reopen the issue, or should I submit a new one?

New one makes more sense.