Sure, it may be temporary. But the most recent federal government shutdown (in '96) lasted 21 days. Which is certainly enough time for issues/vulnerabilities to appear. It's unlikely this one will last as long, but regardless, I don't find it beyond reason that an IT team being furloughed could determine that allowing an un-maintained, un-monitored, site to remain publicly accessible could pose a security risk, or provide out-of-date information that otherwise appears to be authoritative.