An L001 isn't a Gold Nugget. It is however often called a Gold Spot. Difference being the L001 grows to a really big size (being in the same family as the gibby), and is very common and generally much cheaper than "Gold Nuggets".
The plec in this thread isn't a Gold Nugget, or an L001 as far as I can tell. The L001 doesn't have the white edging to the fin and tail, something that is extremely common in Ancistrus sp. 3 (the common bristlenose). A Gold Nugget has brighter and more defined markings, and the body shape of the plec in the pic looks like Lisa's bristlenose too.