in late 2021 and early 2022, NCR insisted that dozens of neighborhood organizations across the City rewrite their bylaws to include a provision that not more than 25% of board members serve more than 6 years. What problem is NCR trying to solve here?

What does the data say?

In 2016, NCR conducted a board diversity survey that shows that 65.3% of neighborhood organization board members had served less than three years. And 82.4% have served less than six years.

The data shows that clearly this was not a problem that NCR needed to solve.