Success in any area is
always directly correlated to some earlier knowledge or skills which took time to develop. The fact that SubmitHub's success is "correlated" with Indie Shuffle's is such an extreme standard that, using it, we could never assign a starting point to anything.
Everyone is quite aware that founders acquire domain knowledge, contacts/network, programming ability, business acumen, ideas, etc before the very day they start their company. I know you mean well, but this comment thread itself suggests the only people misled by the title were those who mistakenly believed that SubmitHub was a simple continuation of Indie Shuffle.
If SubmitHub's users had simply come from Indie Shuffle, or if Jason had simply pivoted Indie Shuffle into SubmitHub, then I would agree with you. But neither is the case.