You can release patches 6 years after your device is EoL but there will forever be more security issues and people using your ancient product (think how long it takes some versions of Windows to truly reach less than 100k active machines. Hell I wonder if Windows 3.1 has really reached that number or not. The long tail is going to be loooong). Not to mention you've created a precedent that the device is still getting patches and can be used by users, only making the lifecycle issue worse.
You can release a version which severely limits the capability of the product or effectively disables it but this is just a guaranteed way of getting bad press and even more customers will be mad at you for killing a device early.
You can turn the device over to the community (if you can managed to get it through legal and 3rd party agreements) but that isn't actually going to solve anything as it's not a product for extremely tech savvy users, at best it buys deflection in the news report in exchange for the effort of doing this (if you can at all).
You can claim the lifecycle is over and years later and be technically correct but still get the bad press and user feedback anyways.
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Retrospective in this particular case it would have been really great for them to fix this particular issue but that's an extremely hard thing to accurately judge unless you're from the future. I mean what percentage of devices that are many years EoL you've heard get this bad of a publicity hit? I'm sure there are many individual cases to point to but it's nothing against the absolute deluge of devices that have been discontinued over the years quietly without issue.