Well, I am no expert on elephants either.
But these elephants caused quite a controversy, being much larger than any Asian elephants ever found, and because of the exaggerated bump or dome on their heads. Some believe these are true relatives of the mammoth, some claim they are birth defects or mutations.
It is hard to find info, but here is one article I found.
http://web.ncf.ca/bz050/HomePage.gne.html
What is truly amazing about the article is that they main reason they give for not accepting this as a "STEGODONT" elephant (even though it has features known only to this elephant) is simply because it does not fit their evolutionary assumptions that it went extinct over a million years ago!