From what Sirius has reported, there appears to be a modified form of a Fidelius at the camp.

We have yet to hear from our people who would've been at the site when the Fidelius would've been activated, if that is indeed what it is.

This appears to be a situation where there are a great deal of unknowns. At this point, I think it prudent to wait for Sirius to report, or for our people to make contact with him.