Nice link! I had read about that post-Premiere edit Kubrick made after his viewing the 2001:ASO Premiere with an audience. (One sees his work with fresh eyes when watching for the first time with an audience.) There has always been overviews on the cuts, but this was the first I've read to actually nail-down specifics for his original Premiere viewing.

Unfortunately, we may never see these trims or other 2001:ASO out-takes. But remember that these cuts were part of Kubrick's final edit ... as much as any other edit he made up to this point. Still, those unused takes would make great extras on the next release.

This I just found is definitely interesting along those same lines ..

A Taste Of Blue Food In Stanley Kubrick's 2001: A SPACE ODYSSEY
http://www.underview.com/bhpalltrims.html

"Our in-depth examination of the subject, and correlation of first-hand reports of early viewings of the film with information published since 1968, resulted in the first edition of this paper: the first complete record of all known changes to the film that had ever been compiled. For this new edition, we have added even more information about scenes filmed and photographed by Kubrick and his aides, but never screened in any public cinema.
...
Almost immediately after the premiere, Kubrick retired to the basement of the MGM building in New York and trimmed the film by approximately 19 minutes. "Trimming commenced at four P.M. on April 5, 1968, and the first session did not end until seven A.M. the next day. Work continued at this pace until the trim was completed three days later." Instructions on what was to be cut were sent to the theatres then showing the film."