This is clearly the one and only motive and reason behind the Med “urgent field safety notification”. The number of people using DIY systems has grown to the point when DIY systems can no longer be ignored by Med, FDA or other players. But, they do not want to have anything to do with DIY systems, and the super-old-turned-urgent notification is just a convenient way for Medtronic to mitigate any legal responsibilities.
I do not know about you, but I am seriously concerned by the cybersecurity issues 
More seriously, the “cybersecurity” term in the title of the notification is absurdly misleading, and is just meant to catch attention of the public, health-care providers, and news media.