It's a mixed bag, on the each project page you clearly see "FUNDING SUCCESSFUL". On the search page you see "and the thousands of other successful projects!"
It isn't a mistake: the project is the fundraising itself, not the business/product that is being funded. People are making funding pledges that only turn into actual contributions if the fundraising project meets its target. If the target is not met, no funding happens, and the project is not successful.
The project is not the fundraising, the project is what's being funded. Just see Kickstarter's emails: "Projects we love: <project name>." They are not talking about the fundraising there.
Additionally, the fundraising status is orthogonal to the success, you can be funded and ultimately fail to complete the project, or not get funded but somehow manage to produce what you wanted to.