Following up, I believe I found a way to do it. If I can source 2 more examples of the watermark, there's a dated repo that I found where we can isolate the sound and then remove it from all the sources: https://github.com/adobe/Deep-Audio-Prior . I will try this with other watermarks that I have, let me know if you are able to help me find more examples. I have a feeling the track is from this guy, https://opmlp.blogspot.com/2012/09/various-artist-hitmakers-lp-series.html since the watermark sounds like "OPM Vinyl Playlist", but for some reason his YT videos are not loading for me.