I am don’t have any inside info on how DC archiving old comics works. But based on what I have read, observed, and what little the mods and others have said. The basic gist of the comics on here with some exception we have basically all the Main DC Digital library (with some exceptions but those are not relevant here so won’t go down that rabbit hole). DC just hasn’t digitized everything.
They seem to digitize around a dozen old comics (old being anything not released that week that hasn’t been digitized) a week give or take. It is not public knowledge exactly how the decision process works. But it is apparently based on what they think will sell as a digital copy on Comixology and the like, as well as viewed here and some other sides, how important the comic and characters in it are to the zeitgeist of DC and how relevant the book is, and in the case of the older comics if there is a good copy availiable to digitize from as DC doesn’t have the entire library of comics in their archives.
Based on your list I sadly would guess most would not be a priority. While there are obviously fans, especially of Seargeant Rock, when there are literally hundreds probably thousands of comics featuring Superman, Batman, Wonder Woman, the JLA, characters currently on TV shows and movies out now and so much more not digitized. It seems something as niche as war, western and fantasy comics probably won’t be at the top of the list. And Tarzan might have licensing issues to keep it from ever being archived at least by DC and thus on this site.
The moderators have promised though that they will forward any comics people say they want to see digitized to the appropriate people who make the decisions, although they also say they don’t know how much impact it will have. And anything added to the archive is added here a day or two later. But probably bringing it up is the best you can do now, and just hope for the best.
Just be prepared, given how slowly they digitize expecting ANYTHING specific to come any time soon, even if it is specific issues of Batman or Detective not in the library is probably setting up for disappointment. Just have to be happy with what we do get and be glad they are adding more comics every week.