When you arrived everything was searched, you were blindfolded, driven and walked blindfolded until you were right in front of the rack of equipment to work on. Even a trip to the bathroom was accompanied by a soldier.
Laptop, hardware, all was left behind when you were done.
I remember thinking "pretty smart, that's pretty secure".
Now I don't think there's any other way than to keep personal mobile devices out of the loop.
And for people of high rank ... I gotta think their kids / family mobile devices are a target too, pickup something over dinner discussion maybe.
We've kinda bugged ourselves with these things.
They are not. See NSO. Maybe they consider this an advantage (known platform) compared with Android where every vendor has its own kernel.
Also "android" could mean any number of devices with their own old software / security flaws.