As usual this is crap advice.
It may matter if you want to be a PR after 7 years as any gap in the visa can exclude you. You also don't need to get your HKID chip updated, this is just utter fallacy.
Best thing, go in ASAP and explain. They can probably get it done fast, if not may just extend you current visa for a week or two and you'll be fine. Going in in person is definitely the best bet.