This style is typically used by those who are changing careers or who have gaps in their employment history.
A curriculum vitae (CV) is more extensive than a resume and is primarily used when applying for teaching or research opportunities.
Believing there's no sense in repackaging the defining moments of their careers, they simply update the top of their traditional chronological resume with a brief description of recent projects, while subtracting a few lines from the bottom to abbreviate (not eliminate) mention of a job at a company they left a quarter of a century ago.
The opposite tack, often taken out of fear of age bias and professional obsolescence, is the "I am whatever they want me to be" approach.
Swayed by well-meaning friends or strident self-help books, these older job seekers start from scratch, selectively creating a chronology-free professional identity from their past that precisely matches the needs of the hiring company du jour.