So basically, are you expecting the reviewer to spend hours and hours of QA testing to try to find bug that the OEM didn't find during the pre-release test?
It seems obvious to me that a technical review will be pretty limited in term of "stability" evaluation. They will run a few tests, but it can't cover all the configurations. Especially things like the wifi issue which were mostly triggered depending on the network environment (what is your access point? What other devices are connected? etc.)
I would imagine the reviewer could have done some investigative journalism: put a call out for people having problems with the beta, collected stories, and set up configurations to try to reproduce those. Not just trusting what people say, but not going all the way to QA, either.
It seems obvious to me that a technical review will be pretty limited in term of "stability" evaluation. They will run a few tests, but it can't cover all the configurations. Especially things like the wifi issue which were mostly triggered depending on the network environment (what is your access point? What other devices are connected? etc.)