It's a picture of the motorcycle in front of a picture of the guy that made it with the motorcycle off in the distance. So it's not a picture of a motorcycle, it's a picture of a picture. So if you want to show a picture of the motorcycle, removing the background would isolate the motorcycle.
I think he is referring to the fact that the photograph is actually a photo of the real motorcycle with the photo I meant to post behind it, at a museum.
"On display in the Midwest Dream Car Collection museum" reads the caption."
I can't find the original, but here is another photo he took at the time:
It's like some people don't even look at a picture and just scan it like it was text to be skimmed. If you don't have time to look at something, then please don't expect to understand the comments made by people that did.
