Did you read the post at all?

Their definition is clearly stated in the first paragraph:

    Using data compiled by the federal government’s Bureau of Labor Statistics, the True Rate of Unemployment tracks the percentage of the U.S. labor force that does not have a full-time job (35+ hours a week) but wants one, has no job, or does not earn a living wage, conservatively pegged at $26,000 (in 2025 dollars) annually before taxes.