It is bullshit, but unfortunately mental health is an area that receives little funding. In a world where it feels like policy makers seem to only care about the bottom line, perhaps making an economic argument might help move the needle on taking mental health seriously. ¯\_(ツ)_/¯
In a sense, being productive is the meaning and purpose of life.
First one must determine what goals, tasks, and activities are the most worthwhile and broadly beneficial to pursue. Then pursuing and being productive in moving towards those things brings happiness, contentment, meaning, and fulfillment.