Professional resume writer and career consultant here, approaching 50, and I’ve helped rehabilitate careers of many clients in similar situations. The line that caught my eye was his quote “I have been unemployed for a long time." I believe the stigma of extended unemployment is worse than ageism.
What I do is a mix of marketing (maximize assets, minimize liabilities, optimize everything), strategy for job search (beyond “spray and pray” resume broadcasting), and building confidence for interviews and the general approach. You have to believe you’ve earned a seat at the table.
There is always more to stories like this. Qualified candidates can overcome ageism with proper understanding of the market conditions.