[UncleMeat]

Disable Lock Screen means disabling the auto shutoff of the screen. This is important for any app that needs to remain constantly visible.

[dawnerd]

But is it actually needed or is it a way they can make sure the phone doesn’t lock if they confiscate it?

[UncleMeat]

The permission does not give the ability for an app to make a user unable to lock their screen. It enables an app to disable the automatic lock.