Ask HN: Explain “DMX ETLs” – Inherited Old + Obscure Tech

Can anyone point me to useful resources, or just explain, what DM Express ETLs might be for? Most of the results I see are about the rapper, not the tech tool. What would be analogous in "modern" data pipelines? I think this DMX is from Syncsort from like 2010 or so, I found some YT tutorials from 2012 but that's about it.

We have a database that's being cloned, the clone is helpful to make faster queries and as a protective backup, I suppose? I am still a beginner, would love any resources you may have on this older technology.