If you don't mention the rules that are too obvious to mention, someone will think they can put together a segmented speed run with their best times from each dungeon level smooshed together into one run. After all, that's a lot of good segments.

And a little bit of 'rng forcing' using outside tools to get drops they want that they can't get and then tweak your fireball damage to make things work for the final boss.

Thats just not what a segmented run is. Just like any game that allows save-states, you could abuse save states to retry any part of 'the run' changing the entire save file to a different run and 'splicing' them together is splicing, which is not allowed. Tweaking fireball damage is literally hacking the game to get the desired result. Unless you find a way to perform ACE with your inputs. Which is not the case here.

Which is probably why they have clarified the rules since then. And why they have always had judges evaluate the submissions to check that the comply with the spirit of the rules.