Yeah based on the linked document, it's missing about 1000 apex domains based on the .gov zone export from today. Even the current-full.csv on the latest commit in github is short about 1000 apex domains.
$ cat 2025-02-21-gov.txt | cut -f1 | uniq | wc -l 13345
But nevertheless, I like seeing it made easily available on github!
(I found it in the data source, but not on the website that was linked to.)