All these emails about checking the accuracy of your registered bank account name sound like a clue to me.
Somehow I doubt the rather mundane HK Interbank Clearing Ltd would give such a tight deadline for a minor issue, but then what do I know...
On the other hand, if I was an employer forced to make a bunch of redundancy payments after Oct 15, especially if the payees have no access to the CX intranet anymore to make modifications to their banking details, I'd try to make sure that everyone sorts it out beforehand to avoid myself some headaches.
What day does the AOA recognition agreement with the company end again?
I dunno... I'm probably just reading into things.