If someone says this unprompted, I’d suspect they aren’t a manager, they aren’t even an employee. They provide roughly the same input one provides while ordering food at a restaurant. Basically they are a customer, but also on the payroll.
That being said, there are some cases where this might be said out of frustration. I’ve seen in my life a few people whose output is mostly finding and bringing issues to the table for someone else (who?) to magically solve them. That still brings some value, and maybe they’d make excellent auditors, but it wears the team and maybe their managers down.