I've seen that listing before ... same exact listing ... at least a few months ago - so clearly it didn't sell at that time, I don't remember if was the same price. It's a really neat table (albiet ugly).
I've never seen it, or seen mention of it elsewhere (not that I've been looking, nor am I any kind of authority on the subject), but I would be curious to see a Simanco stamp or some other supportive evidence that it is indeed a Singer product.