It is essentially a consensus-building exercise that provides the US and its allies with some handy reference material to use when the time inevitably comes to block telcos from using Huawei and ZTE kit in their 6G networks.
In addition to the US and UK, the backers are Australia, Canada, Czech Republic, Finland, France, Japan, South Korea, and Sweden. This lot were never likely to give Chinese vendors the green light, but it may persuade any regional neighbours that might be on the fence to side with them.
Given that China isn't part of this club, it also makes it easier to imply it doesn't endorse these principles and therefore any 6G products originating from China are not to be trusted. Forget the fact it was probably never asked in the first place.