Neither does this article, or the linked site, for me at least - the article uses the word product 41 times, but I'm still not sure what is meant by 'product'.
Honest question, is there some particular criteria for being a 'product' or is it just the hot catch-all lingo for app / site / tool / service?
Perhaps the incredible similarities between many of those 'products' is adding to my confusion - I thought I was seeing some sort of design competition / template collection for a while.