If that is not true, the ME cannot be controlled remotely.
The existence of the ME is much more worrisome in laptops, where the ME can be accessed remotely through WiFi. There, to be certain that there is no way for the ME to be accessed remotely you would have to disconnect or cut the internal antennas and use a USB dongle for WiFi.
As for the second part, I am not sure about how living in a five eyes state would mitigate it. What do you mean by that?
Try analyzing Epstein files and posting about it, they'll give you a proper penetration test of all your devices to see what you found out about their ex employee.
Nowadays even EU citizens migrating away from US cloud providers are a "national security issue".