I admit to not following the link, but sometimes it's a policy thing wrt liability, especially in larger corporations or government. Rather than provide any openings for litigious lawyers who will not miss an opportunity to seize on the fact that you don't have the latest software version (including updates) it becomes the standard to have the best/latest. Otherwise, it can be viewed that the entity (government branch or business) did not take all steps to ensure that data, privacy, security, etc. was protected to the highest degree possible. You can always blame M$ for a security loophole if you're completely up to date, but if it comes down to a lawsuit you don't stand much of a chance if you're using software that is no longer supported.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.