But I know that "that document doesn't exist" is a valid response to a discovery request. Silence is not a valid response, even if the document doesn't exist.
(If one side falsely claims the document doesn't exist, the other side then can present evidence to the judge that the document does in fact exist, and that the first side is withholding evidence. If you play that game and get caught, various bad things can happen to you. The judge can look more skeptically at everything you say thereafter, the judge can rule that the other side is entitled to assuming the contents of the document are whatever would be most damaging to your side's case, you or your lawyers can be fined, and your lawyers can be disbarred. Judges deal with this kind of stuff all the time; detecting and blocking such games is a major part of what they do.)
The rest of your post is speculation.
Is that not available somewhere? You'd think it would be presented in detail, since this is the key reason for the default judgement.
I suspect things are more on line these days rather than less, but I haven't tried lately. If nothing else, you should still be able to see everything on PACER. (If they are online instead of in PACER, there may be a delay time - three months, maybe? But for this case, that shouldn't matter.)
For state courts... I don't know.
The Jones side claims that these discovery requests were for documents that don't exist. The linked judgement provides no detail on what the specific discovery requests were that went unanswered.
Do you know what the discovery requests were for specifically?