When WHOIS info is correct it can be a big help. I've done the same for phishing scams hosted in the US. The person on the receiving end is usually somewhat confused at first, but eventually gets it.
That seems an awful lot more like a, "shit, someone's connected the dots" response. Especially if you're claiming ignorance about the domain name being called about. 15 seconds isn't even long enough to walk down the hall and ask someone about it.
Even if not a literal 15 seconds, the phrase doesn't seem to imply that there was a length of time where someone on that end might have been investigating the issue. It implies that someone flipped the switch to "off" the instant one was able to get within reach of the switch.