Seems Nexus is locking and burying any threads attempting to talk about this issue and then pretending it is answered. Petty. Although it does appear I have an answer to my question in a round about way: no, Nexus has still not bothered making their mod manager available on Linux, nor are they working on doing so properly. Considering it has been years since I used this site because of that and a couple years since I checked last to see what was up on that front, just to find literally zero efforts on the issue, well, I guess I will continue not using the site and start looking harder for alternatives.