It's simply acknowledging that skepticism doesn't concern itself with non-testable claims.
What?
This is a joke, right?
Is it possible that someone who wants to be considered a skeptic accepts limits on the scope of inquiry?
Sorry for being late to this, but when I saw that piece of fluffy nonsense....
To answer the initial question, if god is defined such that it does not admit of verification/refutation, then a skeptic MUST be agnostic, by definition, recognizing that the question is unresolvable in terms of empirical verification.
However, if a claim to knowledge is being made about a god or gods, then the skeptic is well within the scope of legitimate skeptical inquiry to challenge the claim to knowledge. It is not the definition of skeptic that then drives one to atheism, but the concept of faith that does as faith is an inflexible assertion of knowledge not subject to verification/refutation, an affirmation of the unconfirmable. This is really quite simple and shouldn't (one wouldn't expect it to) cause anyone any real mental strain unless they're desperately clutching at straws...
Skepticism is about claims to knowledge, by definition. Any claims to knowledge. Any. No special exceptions or exemptions. No puppy-dog eyes.
What advances we have made, in terms of human efficacy, have been made because we have chosen to refuse to limit the scope of inquiry. We are done with the sacred. It has consistently failed us, every step of the way. Worse, it has hobbled us, just as it is hobbling the thinking of modern day so-called skeptics seeking to undermine the simplest, most pivotal, defining concept at the heart of skepticism - the eschewing of certainty.
It is truly astonishing (though not surprising) the kinds of mental/emotional acrobatics undertaken by those who want to weasel out of inexorable conclusions just to prop up personal desires. Worse are those who allow the scope of their inquiry to be limited by delusions, however "cleverly" stipulated. Even more ridiculous, however, is the permitting of the redefinition of skepticism so that it allows for whole realms of nonsense no longer subject to scrutiny.
There is no faith-based limits to skeptical inquiry. The idea is simply absurd, incoherent, self-contradictory.
There is a rot near the heart of the JREF, and it is undermining integrities - such as they are...
But then, I'm an atheist, and the JREF is not an atheist organization. It is not merely neutral with regard to atheism/theism, it makes a special point of publicly declaring it is not an atheist organization. The rot eats away...