YSK What to do if someone’s choking: Evidence says begin with back blows

Why YSK: > Despite choking being an emergency, until recently there has been limited high-quality evidence to guide bystanders on the most eff…

Interesting because all of my first aid instructions say not to slap people on the back. Why should I believe this over instructors and doctors?
The sources for this are also instructors and doctors, OP listed them. It sounds like this is new research and best prescribes may be in the process of changing if further research bears these findings out.