The problem is that the more time goes on the more is discovered as to when pieces were actually written so you get more and more convoluted trying to renumber things. The solution they arrived at was a compromise toward simplicity mixed with comfort.
That said it's still pretty inconsistent in what it seems to keep in the main sequence vs the appendix as far as works that are doubtful goes, or what constitues enough enough a piece to get assigned a number vs keeping is as just a sktech...
The ongoing discoveries about the chronology of Mozart's works add complexity to the numbering process. It’s a delicate balance between maintaining a clear sequence and accommodating new findings.
It was recorded by the International Assocation of Music Libraries but only for their members.
Apparently some Spanish-language speaker posted a bootleg of it (with Spanish subtitles), in English, but the sound is very poor:
Fascinating update on the new Köchel catalog! Reverting to original numbering provides welcome clarity. The appendix identifying misattributed works is also crucial. I wonder if future editions will include more thematic indexing? I'm keen to explore the online English version when available.