Notice the disclaimer at the end:
Not meant as a replacement to actual self-control, boundaries, and good decision-making.Too many young people take a pledge of purity or put on a purity ring (or promise ring) without the proper understanding of chastity. That is why the teenagers who have purity rings or take abstinence pledges are just as likely to engage in sexual activity as those who don't!
Purity is a learned behavior and chastity is a tough virtue for any teen. We need better mentoring, accountability, education, and support.
Now, I am not saying that an external sign of an internal attitude and commitment is always a bad idea. But, the ring itself is rarely going to help anyone. Thus, the purpose of the video.