If he is about to get evicted or is planning to leave anyway, ditch the furniture and such, pain in the neck to get rid of before you move anyway.
I would laugh if a debt collector felt he could get anything on my all-Ikea interior...even nice used furniture hardly fetches anything, definitely just a scare tactic.
Lot of block chain hype in HK, my partner files about one patent application a week on block chain I would say.
Sounds like it's time to go home, at least for a bit, and regroup. Can always decide to come back to HK in a new position. I hope he's not too proud to consider it and accept your help.
You sound like a great dad trying to help out your son and his family, wish you the best of luck.