You should really inform Schorman that his 1983 Japanese LD’s don’t really exist and his 1985/6 US LD’s must have been made later.
What they probably did was use the existing master. I lost count of how many early DVD’s were made from the LD master tapes. No reason to expect that was a new thing. Knowing a bit about corporate mentality, there would also be no reason to tell the engineers.