Hi Testcard
I'm not 100% sure what you mean by this but I'll reply with what I believe you are requesting...
All the Discog entries you refer to as vinyl releases are from those Discog members that have had the vinyl and shared the track listings, composers, label, catalogue, year and photo of the sleeve. The entries are not provided by the original library albums publishers. These entries on the website are from likeminded people on here providing information for other members seeking long lost library albums. These will relate to anything vinyl, but not exclusively. Many will also feature CD releases. At the bottom of some listings, it may provide alternative or re-release versions. So, for example, JW Media released vinyl albums under the Impress, Josef Weinberger and Programme Music labels. So some releases on Impress may well have been re-released years later under Josef Weinberger, again as vinyl.
To add, most libraries did not re-release their vinyl as a CD so many were never available on other formats for download/audition. Those that did released them with albums that contained tracks missing, some added from other albums and even a different album title. Some libraries now have their original vinyl and cd's on their websites to download as either MP3 or in lossless format. However, the majority of those older more obscure libraries have been lost in time and have not re-appeared on larger music distributors such as APM etc that provide dozens of library music labels. So, again using Josef Weinberger or KPM as an example, the majority of their original vinyl albums were then uploaded to the distributors website (APM as an example). Some as originals from the master tapes, some tracks re-mastered. At the time of vinyl and CD releases, there wasn't a digital format or website to upload their material too.
Going back to Discogs, the users on that site will then not list those albums that are only available on the music publishers websites that are not available in physical form and only available for audition / download.
Hope you can understand what I'm trying to say on this and feel free to add anything else to this as I'm sure other members will have differing opinions.