With the bleed rates that most aftermarket HR lifters have, combined with the elevated spring loads most of the associated cams require....... I’d expect the lifters are substantially bled down, which shortens the cam timing during the cranking pressure test, which gives a higher number than what the true dynamic CR would be with the motor running and the lifters pumped up.

It’s like an extreme example of the principle behind Rhodes Lifters.

If one was curious what the difference might be, they could bottom the lifter plungers out on one cylinder, and see how that impacted the cranking pressure results.