No what he's complaining about is that the ad network laden DNS server provided by the company had a longer TTL than what was provided which lead to numerous complaints. I've actually seen this happen before with Google DNS where I've of their servers would randomly choke on our DNS settings because of something obscure we had set. It took us weeks to get things fixed because it was only a very small subset but anyone using a Google DNS would have intermittent problems that whole time. We've also seen local ISPs cache temporary statuses for far, far longer than what the records TTL. This is definitely something that happens.