System Extensions是macOS的一套系统拓展机制，从macOS Catalina开始出现，具体可以参考Apple Developer的这篇介绍

What if an application fail to uninstall its own system extension?

At this time, this tool cannot be used if System Integrity Protection is enabled.
This limitation will be removed in the near future.
Please remember to re-enable System Integrity Protection!

（希望Apple有关解除限制的承诺能尽快兑现。

Last modification：May 29, 2021