Ah. I missed that while skimming through the page. I was primarily responding to the statement made that "they are also called “time zones” in casual conversation." They are time zones in the official sense of the word.

Speaking as if the Olson tz database is authoritative and official reminds me of when some small country cancelled summer time with only a few days notice and our OS vendors were not going to be putting out a patch in time. While explaining the process of downloading the Olson tz database and updating systems manually, a coworker asked who gave them (the country's government) permission to cancel DST. It took longer than it should have for me to come up with an explanation that sovereign countries don't need permission from the Internet or OS vendors to change their laws and regulations. The computers track the government actions, not the other way around.