I have the DOC source material ready.
The DOC itself is created from code taken from CP directly and thus open source. No issue.
There are comments on each DOC when the DOC exists as well in WP, example:
I can import all those comments (whatever existed up and until WP 4.9) into our own DOC as well.
However, of course, I can’t import the users who authored them because those are WP Users, not CP Users.
Thus, if I import, it will be a comment added by Contributed by — 23 seconds ago — Edit
See screenshot of my local:
Legally this is no issue, as all those comments are https://www.gnu.org/licenses/fdl-1.3.html, but, it might be not nice. Thus I will wait with them, since I can import the comments at any given moment also after creating the main doc, there is no requirement to do so during the main import or “asap” at all.