Just looking at the map doesn't tell you what hardiness zone means or how to apply (and not apply) this knowledge. I would say it makes you feel informed by teaching you a piece of trivia ("I'm in zone 8a") without actually informing you by giving you the tools to use what you've learned.
==without actually informing you by giving you the tools to use what you've learned==
The title of the article doesn't imply that it will teach you how to implement. The title explicitly states it is a map to show you the shift in zones, and it does that very clearly.
