There's not a whole I can say
.
As Tune went into the late 80's/very early 90's necks/bodies and hardware were imported from the Korea for assembly in Japan.
The Korean company was Hatsun,part of WSC Music. Now a fairly large concern they supply guitar hardware to OEM factories and their pickup branch (Roswell) build for some large players. The large players include Fender, ESP, Fernandes, Tagima and of course Tune.
Later Hatsun took over both assembly and distribution for Tune.
When Tune in Japan went bust WSC still had orders to complete and continued production. For decades WSC have had the rights to Tune Guitar Technology. It's not a big part of the business and my feeling is WSC keep it going more for nostalgia than profit.
The Tune Guitar Technology in Korea vs Tune Guitar Maniac is a murky area. I only became aware there was a Tune still operating in Japan a few years back, this was after an American living Japan offered to promote the basses in the US.
Obviously he was upset to see his business plan crumble when he discovered Tune in Japan didn't own the name

It was then I started to hear claims of stolen trademarks etc.
There been several claims. In one the original Tune boss passed away having made a verbal agreement with WSC, in another the boss and money had disappeared
Given the centuries long animosity between the 2 countries I doubt we'll ever get the full story