It looks like it wasn't a big deal to perform the lookup, so I guess it comes down to what the engineer was familiar wit. It does say later in the post that th

It looks like it wasn't a big deal to perform the lookup, so I guess it comes down to what the engineer was familiar wit. It does say later in the post that they used a local proxy to confirm their findings, too. Maybe they wanted to check from both sides, just to be sure.