Everyone codes differently and even if doing a remake you would have to still revisit every line of code that was written to understand the logic and how to get from point a to b and b to c and so on. Now also take into account and I guarantee that there is code in there that Tiplick wrote where she had future events and tie ins in mind. As
Somedude02 stated, there was an effort a while back in discord where they were looking at doing the same thing you are talking about. The main issue if remember correctly was how things were written. In the end they wound up doing some minor fixes.
Now if you ignore the code completely then it might as well not be this game. The code basically goes along with the story. And writing everything from scratch and to reproduce the same thing would still require someone with a good understanding of Twine and some might say just as much effort or possibly more as you would be defining and writing everything from scratch but if you wanted the same story same characters you would have to keep referring back to what Tiplick coded.
The final fix release was not released by tiplick if I remember correctly but by the folks in the discord. In fact supposedly there was a 5.7 that had been made available to supposedly to patreoners but it didn't include much more in the way of play and while it made it to the next dock or something like that. Again I don't know anybody who saw 5.7. It really didn't add anything which was why the discord released what would become 5.6 fix 3 i think is the last.