The article shows a screenshot where a heatmap shows how users click on the "Get Started" button a lot and then goes on to state:

Looking at these results, the CTA variation design results are much more focused, with hardly any clicks on other elements. I’m calling this a win.

As if getting people to click this button was the goal. Which is is not, the conversion to an engaged user/customer is.

The alternative there was a email input field plus button, which also received the bulk of the clicks, and immediately resulted in commited users providing vital contact information.

For example, i would click this button to see whats hidden and subsequently leave the site anyway. Many users clicking this button as the heatmap shows are not actually engaged and converted..

Author here! Would love to hear if you have comments or feedback,or if you've done some similar research!