It's part of the new proto file released with lnd v0.18, with additional parameters for updatechanpolicy in lncli and the APIs. I don't see the reason, but you could check the existence of these parameters if you don't know the version of lnd itself.
updatechanpolicyinlncliand the APIs. I don't see the reason, but you could check the existence of these parameters if you don't know the version of lnd itself.