I'd really like to understand this deeper: are you sure your macbook was hibernating, even if it was closed? Are you sure the proximity advertisement came from the laptop? Usually it is the iPhone doing it.

I've seen that in airports and malls, more than 90% of the advertisements around are iPhones (Android doesn't do BtLe advertisement) and Windows computers (from the shops and stores). A small minority are beacons and wearables (iWatch, Fitbit, etc.) In libraries sometimes I can see Macbooks, but they all are non-hibernating.