I read on Blacklens, the conversion studio's Facebook page that the G 45/2 barrels are being made in collaboration with LAC, the user group that contracted the G 35/2 barrels and sold the finished lenses through Wechat. So I assume there will soon be some finished LAC G 45/2 for sale in China too, albeit with the same "original optic blocks sealed in a warehouse" story. It will be a giant coincidence if they'd be able to manage that for a second time.
The water is rather muddy so I care not to make judgements. But it seems that converted lenses sold by Blacklens do not come with that story.
Bottom line is I do like the barrels, especially in the retail FUNLEADER iteration. They are much better made than Miyazaki ones, handle better too and the conversion is reversible. Some good staff for everyone.