I don't follow. No special support channel was opened up here. The u/AWSSupport user just linked them to the standard "get account support" link that everyone else uses.
I'd also note that a special support channel isn't really needed here. This situation (lost access to account due to owner no longer being available in some way) is a common situation that AWS Support is pretty good at handling through the standard channels.
I'd also note that a special support channel isn't really needed here. This situation (lost access to account due to owner no longer being available in some way) is a common situation that AWS Support is pretty good at handling through the standard channels.