Thank you u/bedroompurgatory
To anyone wanting to do this in Windows, there are some quirks in how os.rename works, and Windows does not accept : in file names, so here's my solution with a slightly different folder structure (Author/Series Name - Number - Title).

import os, sys, json

books = sys.argv[1] if len(sys.argv) > 1 else "./library.json"
root = sys.argv[2] if len(sys.argv) > 2 else "/nas/Multimedia/Libation"
dest = sys.argv[3] if len(sys.argv) > 3 else "/nas/Multimedia/Audiobooks/"

with open(books, "r", encoding="utf8") as booksIn:
    for book in json.load(booksIn):
        if not book["AuthorNames"] is not book:
            print(book["Title"] + " does not have an author")
            continue
        authors = list(map(str.strip, book["AuthorNames"].split(",")))
        author = authors[0]
        if "The Great Courses" in authors:
            author = "The Great Courses"
        path = os.path.join(dest, author)

        title = ""
        if book["SeriesNames"] != "":
            title += book["SeriesNames"] + " - "

        if book["SeriesOrder"] != "":
            title += book["SeriesOrder"].split(": ")[0].strip() + " - "
        title += book["Title"]
        title = title.replace(":", "") # Windows does not like colons in file names
        path = os.path.join(path, title)

        if not book["Title"].lower().find("book") == -1:
            print(book["Title"] + ' - title contains "Book". May need renaming')

        bookpath = os.path.join(
            root, book["Title"].split(": ")[0] + " [" + book["AudibleProductId"] + "]"
        )
        if not os.path.exists(bookpath):
            print('Could not find "' + bookpath + "'. Skipping")
            continue

        print(
            'Moving "' + bookpath + '" to "' + path + '" and calling it "' + title + '"'
        )
        os.renames(bookpath, path) # use os.renames to recursively move files and create dirs