devtrackers.gg
On PS4 it's off by default I think
Correct, motion blur is always disabled on the base PS4 model and the option will only appear on Ps4 Pro and other platforms that can maintain stable performance while it's enabled.
However, we recognize that it can be a confusing message and will be removing it from the mode description shortly.
Update 5/23: We're doing further investigations on motion blur for all devices.