Re: "The decision will please US authorities"
Not necessarily. It all depends on which "US authorities" you are talking to.
The better US intelligence agencies probably have a significant cache of vulnerabilities that they can work with. It might take more time to find them versus baked-in back doors, but Huawei has a reputation for poor code quality, so it probably isn't that difficult. So letting people think that the US doesn't have back doors is probably advantageous to their snooping of their others' networks.
The people and agencies that are upset with Huawei because of economic and nationalistic reasons are probably going to be the ones who are happy to hear this news. And I have little doubt that they were playing up the more sensational security threat aspect because nobody cares about boring corporate espionage and IP law.