According to the report, apparently Google feels that having Huawei no longer be part of the Android ecosystem could spell bad news for national security. This is because they think that by fragmenting Android, it could weaken its operating system and allow foreign players into the Android operating system.
Huawei is largely expected to create its own operating system and some believe that it will still be based on Android through AOSP, which would essentially resulted in a forked version of Android that will not be covered nor protected by the security features part of the Play Store and the security updates released by Google every month.
The argument is that if someone with a secure Android phone sends something to a Huawei device that might have a compromised version of Android, it could leak data that should have otherwise been encrypted. Whether or not the US government will buy Google’s argument remains to be seen, but for now, Huawei has been granted a 90-day reprieve until the ban goes into full effect.