Why? The source code forms the authoritative rules of the game, and the Four Freedoms¹ apply to those in all Olympic sports, right?
That's as ridiculous a strawman as saying "The Olympics mustn't have any rules about performance enhancing drugs, otherwise athletes would have to carry bio-chemistry textbooks in their pockets".
As for the inspection, I guess it would be nice. But an esport Olympics would include multiple games so at some point it's too inconvenient. Also, all player play with the same client/server technology. So you'd have to think very cynical to think that there would be any tempering by the developers.
At some point there is a remaining risk. Same hold for traditional sports where there are judges who introduce their subjective opinions.
The meta or something has to evolve, but not the rules. The basic rules of soccer, etc. don't evolve.
And video games are in some respect a form of art, so any judgement like this is incredibly subjective. Just as many people prefer classic art to modern, some people prefer classic games (eg. old, harder Tetris to new, Super Smash Bros Melee to newer Smash).
(Edit) But to say "Using an open source structure or a committee for this would probably be slow, or doesn't work at all as it prevents meaningful/drastic changes." seems wrong. As an anecdote, I considered myself a "gamer" in middle school, and beat the highest rated game of all time (LoZ:Oot). As I've aged I've gamed less, but during the pandemic I've played a bit of NetHack, and found it a more interesting game, and its decades of history and evolution seem to show more dedication than any proprietary game has received to me.
That's absolutely not true, unless by basic you mean things like "played with a vaguely round ball". FIFA change the actual rules every year. The new handball and wall rules are pretty big changes.
https://soccer.nbcsports.com/2019/06/02/new-handball-goal-ki...
The rules for swimming and running are similarly changing constantly. Google the controversy about the faster water in Beijing that was used to cause more records to be set, or the rules about shoes in running.
The fact that someone who doesn't know about a sport thinks it's not changing doesn't mean it isn't. Ignorance does not convey some kind of deeper insight.
Thanks for helping me make my point ;) : change in highly competitive sports is often viewed as a bad thing