Your info is out of date, as they have already fixed the browser update issue. Modern IE will automatically upgrade when new versions are released - you can see this by looking at the adoption rates for IE9 -> 10 -> 11.
However, there are still a lot of users on IE8 and below, which did not have auto updating. As people gradually migrate away from these legacy versions and get onto the evergreen track, then the situation should improve until IE's overall upgrade rates match those of Firefox and Chrome.
I don't see how this is fixed. According to StatCounter, IE shares are: IE8 6.7%, IE9 3.8%, IE10 4.0%, IE11 9.0%. IE10 is supposed to have an "install new versions automatically" option and yet still has close to half the share of IE11, and IE8+IE9 share is still greater than IE11 share.
I thought the "install new versions automatically" checkbox simply meant that new Internet Explorer updates were installed along with automatic Windows updates, where before they were optional.
If so, aside from enterprise, there's (sadly)a significant fraction of home users that turn off automatic Windows updates because they regard them as a hassle.
However, there are still a lot of users on IE8 and below, which did not have auto updating. As people gradually migrate away from these legacy versions and get onto the evergreen track, then the situation should improve until IE's overall upgrade rates match those of Firefox and Chrome.