If you paid course fees and did the work, you should be able to walk out and say 'I am a C student at RoR' with a certificate.

A company which hires through boot camps can ask for grades and choose to hire or not.

A C level student with other skills may still be valuable because of other skills they have and employable for junior or non dev roles.

Setting such a high bar pretty much just seems to be a way to manipulate data for marketing purposes.