On our last trip to Bruges we booked a taxi in advance with others from our roll call. The advantage is that they can drop you in the centre of town and you can stay as long as you like.
That makes it fairly clear that if you watch from the ship it will be via a broadcast rather than from your balcony. You'll certainly be able to see the crowds but there won't be much of a view of what's happening on the stage.
Our previous calls to Liverpool on QM2 have been starboard side to the quay but I believe she is going to be out in the river so may turn round.
Looking at the Cruise Liverpool site it seems about 50/50 for other ships.
That was why I asked, I wondered if this line meant if you called and asked for a refund they would give one.
"Should you wish to discuss your booking, please call our Customer Contact Centre who would be happy to help."