You can flag here, but the mainstream press has picked up the issue:
"Can the US switch off Europe’s weapons?"
https://www.ft.com/content/1503a69e-13e4-4ee8-9d05-b9ce1f7cc...
"Such is the concern that debate has turned to whether the US maintains secret so-called kill switches that would immobilise aircraft and weapons systems. While never proven, Richard Aboulafia, managing director at consultancy AeroDynamic Advisory, said: “If you postulate the existence of something that can be done with a little bit of software code, it exists.”
In practice, it may not even matter because of how already reliant advanced combat aircraft and other sophisticated weapons — such as anti-missile systems, advanced drones and early warning aircraft — are on US spare parts and software updates."
There you go, finally mainstream press and politicians are mentioning the kill switch.