I don't own one, but with the size of the light and the capacity of tool batteries, 2500 lumens should not be any challenge to achieve.
If you scroll down to the reviews on Home Depot's listing for this light, you will see a reviewer comparing it to one of the cheap zoomies that typically advertise thousands of lumens, and typically achieve hundreds. Since his zoomie is the 2x18650 version, I would guess it achieves 500+ lumens. They Ryobi is clearly far more intense in the photo despite also having a larger hotspot.