Lol no it doesn't work well because it's completely arbitrary, and you can't accurately determine the quality of multifaceted private messaging apps with a single metric.

This is marketing bullshit, not a legitimate system for evaluating the quality and strength of the different platforms. It's designed so that shills who have a financial interest in peddling a particular platform have a metric to point to to justify the sale. It's an instrument of security theater, and salesmanship.