from what research and medical testing ive seen on that technique its only really beneficial for those with NO first aid training who are unwilling or unconfident to do rescue breaths as most people can do compressions so its better to do compressions than nothing.

the evidence theyve shown only shows it having a better outcome because the average person has no first aid training so would fuck up trying to do it properly.

Obviously someone with first aid experience has the knowledge and training to do it properly.