Perhaps, we just make it obsolete whatever categories it currently obsoletes (in the same way Princess-only run of SMB2 once obsoleted any-fastest run).
Later, if a low% movie is made that is longer than this run but has lower %, it could be branched again.
So, this movie would obsolete
http://tasvideos.org/1073M.html ,
http://tasvideos.org/260M.html and
http://tasvideos.org/1075M.html , but not
http://tasvideos.org/817M.html .
1073M: any%, real. Also this movie's goals.
260M: low%, real. Not this movie's goal, but this movie beats it in this category nevertheless (lower collection percent, and faster than any other attempt on that percent).
1075M: any%, ingame. Not this movie's goal, but this movie beats it in this category nevertheless (smaller ingame time).
817M: 100%, real. This movie does not accomplish 100%, so cannot obsolete.
Arguments against:
1073M: Final boss is skipped, lower entertainment density.
260M: Not this movie's goal.
1075M: Not this movie's goal.
The final boss is still seen in the 100% movie. For those looking that experience. If the 100% movie is eventually changed to skip the final boss, then the issue becomes different. At that point, it might make sense to make some kind of sightseeing movie.
As for the "not this movie's goal" question, that is resolved by paying attention to the fact that this movie will not be called "any%, ingame" or "low%". It is still a "any%, real" movie. It just happens to obsolete the movies for those other branches by accomplishing their goals better than they do, despite not specifically aiming for that particular goal.