Sorry but I still don’t see any water. It is only an assumption water is causing any shifting. Being a different planet, we have no idea what could cause it.
They do have an idea what might be causing it.........water.
If you don't understand the complex science behind remote sensing, then you need to believe the people who do. The Earth has an iron core - no doubt whatsoever, but no one has ever seen it or observed it directly. No one with any scientific background disputes some things, because the evidence is rock solid through observations, direct and inferred. You could say that the Earth's core might be made of grape jelly since no one has been there, but if you want to take the time to learn the science you will see very quickly why the indirect evidence wins out for iron.
If your doctor tells you you have a brain tumor or are on the verge of an aneurysm because of indirect scientific evidence, are you going to doubt him until someone shows you first hand?
No, but this assumption is based upon the data indicating that the major surface component of Titan is water ice.