This is wrong, the GPLv3 only requires installation information for "User Products" (as defined in the license) which the manufacturer can update even if the user can't. Most medical equipment isn't User Products and can't simply be updated by the manufacturer for regulatory reasons.
That article was written before the finished GPLv3 was published, they had only published a stricter draft.
User Products would I'm pretty sure still target things like pacemakers and other daily technological appliances some people need to get around and I'm fairly sure those require the same FDA approval process.
That article was written before the finished GPLv3 was published, they had only published a stricter draft.