One of the things that a lot of LLM scrapers are fetching are git repositories. They could just use git clone to fetch everything at once. But instead, they fetch them commit by commit. That's about as static as you can get, and it is absolutely NOT a non-issue.
No... Basically all git servers have to generate the file contents, diffs etc. on-demand because they don't store static pages for every single possible combination of view parameters. Git repositories also typically don't store full copies of all versions of a file that have ever existed either; they're incremental. You could pre-render everything statically, but that could take up gigabytes or more for any repo of non-trivial size.