There are plenty of ways to get access to gemini - a single google search took me directly to the simplest way (subscribe to Google AI Ultra) in one click: https://one.google.com/intl/en/about/google-ai-plans/
The author apparently found himself on a much more difficult path, one designed for enterprises who are already on google cloud, already have billing set up, etc. The fact that an individuals experience with an enterprise platform isn't great is predictable... That's why there are individual/consumer plans for this stuff.
Does it let you use Gemini 3 in Gemini CLI?
The url you sent, when signing up, just sends me to my homepage where I get a overview of my subscription at one.google.com, I can't see where to access a api key