LR and new tank cycle no ammonia??? is this true

[untamed]

Since you've said that you want to light the rock while curing, I'm assuming that you want as much life to stay alive on your rock as possible. I agree with that approach, but others would disagree and mainly just want their LR to house bacteria and not much else.

So..Water changes... Yes, I would do them while curing the rock. You'll reduce the build up of ammonia and nitrite which can both be harmful to anything trying to survive the cycle on your rock.

When you go to transfer the rock to your new aquarium, there is no particular reason to transfer the water also. Doing so would just mean that you'll need to make less new SW to fill up your display. No bacterial benefit either way.