I don't see anything wrong or a "rowing back" with what Fairphone wrote. They simply answered the question and said that as of today you can't buy a Fairphone 2 with SFOS preinstalled and there's no official support yet.
They posted two times about the partnership like "Fairphone partners with @JollaHQ.", also a poll about alternative software ports.

So personally I'm pretty sure, that with this partnership we'll get more than "just" community ports - but things aren't ready yet to be announced and/or brought to the market. As an European customer I certainly hope that we will have an official hardware partner for Sailfish OS .