Are we reading the same blog post? He had his password, 2FA authenticator set up, and backup codes -- everything Google asks you to have to be on the "golden" auth path.
He only deleted his SMS authentication path (one thing I don't understand is how he was able to do this in the first place without being logged in), which is in any case the least secure method of 2FA. Also, It should be fairly obvious that SMS is not expected to work seamlessly while traveling, how is this not a scenario that's hit by millions of Google users worldwide?