Now, audits are generally not worth very much (even, perhaps even especially, from a Big Four group like KPMG), but for this type of thing (verifying that a company isn't doing something they promised they would not do) they're about the best we have.
"We committed to never writing the querying IP addresses to disk and wiping all logs within 24 hours."
"While we need some logging to prevent abuse and debug issues, we couldn't imagine any situation where we'd need that information longer than 24 hours. And we wanted to put our money where our mouth was, so we committed to retaining KPMG, the well-respected auditing firm, to audit our code and practices annually and publish a public report confirming we're doing what we said we would."
> "We committed to never writing the querying IP addresses to disk ..."
A DNS resolver does need to record the querying IP for at least a few moments because, you know, they have to respond to your query.
However, I don't know why they changed that sentence; it could be for other reasons too.