"Must have gotten the memo from the Department of Redundancy Department."
Actually, the seller was smart to list it that way. If someone searches for "laundry soap," they find it. If they search for "laundry detergent," they find it. Successful sellers on eBay use keywords that may seem redundant, but they are what the name says: key words for searching!
If I was to list a washing machine on eBay, I'd not only put "washing machine" in the title, but the word "washer" as well (for those who may only search for "washer," as in "washer/dryer").
Just two cents worth,
Chuck
(No, I don't call it an ATM machine! That would be redundant!)