I think someone in docs/management or marketing has "reworded" the alfresco one stuff it to make it relevant to the real world not realising that DAM may be a loaded technical term. But like "WCM" and "ECM" itself the term "DAM" is vague and un-clearly defined.
And DAM is and always has been a core capability of alfresco, not something that is bolted on or could be removed. I could argue that alfresco is a DAM system with some ECM capabilities. However in the real world that would be a waste of time, just as "ECM" leaves customers cold so does the vague term "DAM". I sort of agree with what was done with the web page so what's the solution.
I also agree that there's a problem. I quickly found some nonsense about alfresco not supporting DAM using google.
FWIW I didn't think the old web page about DAM worked either.