He’s not exactly vague about it. As @megguspee pointed out above, he gives all the details you crave in his article.
And again, none of that is relevant to the issue he is raising. Which is that in response to his having been sold a stolen giftcard Apple decided to and could prevent/restrict his access to his entirely legitimately purchased stuff without any recourse.
He thinks more people should be aware of that and plan accordingly.
