Can you please provide evidence to your claim that deflation leads to lower prices and unemployment? That is a claim that contradicts most modern understandings

Can you please provide evidence to your claim that deflation leads to lower prices and unemployment? That is a claim that contradicts most modern understandings of economics. The last major deflationary event in the United States was the Great Recession and personally that seems a little out of touch to be calling that a time of prosperity for the layman.