For my purpose, commercial or consumer is irrelevant, but I understand you are coming from the consumer angle.
I've always thought the "Notice to Co-Signer" should have been entitled "Notice to Guarantor" to avoid confusion, but that's just me.
Look carefully at the notice and you will see it states "If this debt is ever in default, that fact MAY (emphasis added) become a part of your credit record." "May" means "at our option" and we opt to report it only if the guarantor/co-signer (as opposed to a true joint applicant) does not step-up to the plate when called.
Aside - be careful of "assumptions" when speaking of reporting to the credit bureaus. Joint signers either are, or are not, reported and there should be a code or system setup somewhere that tells you which you are doing.