Correct me if i'm wrong but i think these were made by capturing the laserdisc to super vhs and then making DVD's out of them.
This was done to get rid the side swap issue if i remember reading about it correctly.
Obviously with software and a computer one can do a far better job.
Also the Laserdiscs are not the best picture quality source in the first place, that is why people have used DVB over the air pal recordings, and a digibetacam tape for reconstructing these versions.