Checking the Mauville gym fight looks like rng manips should have been used but were not for example, but not sure maybe the author could explain?
There are some frames at the end of the movie that could also be truncated.
There was RNG manipulation in the mauville fight (and I'm guessing specifically the magneton). If I'm remembering correctly, the linoone would have needed 2 crits to take out the magneton and magneton always goes for thunder wave if you're faster. I'm probably found that using the x attack was faster than finding the 2 crit frames.
There is certainly time lost compared to the theoretical "perfect run", especially if someone spent the time guaranteeing no crits while farming rare candies.
Considering too the kind of boringness that this TAS has, that at least has been seen so far in responses, it's probable too that this TAS might not be publishable per se, and would just go to Playground.
And with how "boring" this run is (I'm not saying that sarcastically, you have to skip over the grinding sections while watching) imagine a few hours of just menuing to get a complete living dex (and that would include every gen I-III mon) and then just doing a regular playthrough. I would also think any 14h+ run would be boring (the longest TAS here is [3386] PSX TOCA Touring Car Championship "max points" by Noxxa in 10:30:25.84).
The most interesting thing about this run to me is the pickup abuse. Maybe a more "exciting" run would be the challenge in Ruby/Saphire since pickup doesn't depend on levels, so you don't need to initially grind up a zigzagoon to level 21 before you start collecting rare candies. I think that run could easily be sub 10 hours, maybe even sub 9.
Personally (completely biased), I think it should be published since it'll be the longest TAS by a wide margin.