Not sure about the effect on him since he has been off in boxing for 2 years.
We've seen a lot of upsets lately because of ring rust, and everyone is not immune to it.
Yes, you are right, he is mostly in the Asian scene and not a champion in the major 4 belt. But I still consider him a champion though.
as you said, this has been very old and can even be compared to an item, it has been stored for a long time and has started to rust so it needs to be sharpened again so that it is like before.
I hope for something good for him but of course this now depends on the effort he puts into making the most of this time