It's known now, thanks for the heads up
I sent in for a delisting; the site that apparently caused it (as indicated in that message) was issued a permanent suspension for phishing (probably obvious based on the domain name choice) after we got an abuse report for it earlier. Didn't get one from Spamhaus telling us we were listed though, or we would've worked on that right away.
Spamhaus's DBL advises it may take 30 minutes or more for it to update/sync with customers, but the delist is in. Thanks!