No, I am not interested in the motivation at all, and it plays no role. That is the logical error you make. You are trying to make an argument based on current data, but that current data does not include the fact that income is correlated to location, but UBI is not. So your current data is not a proof of anything, really.
In general I agree with your view though that UBI could be captured by landlords, and that landlords are a special case. So let's introduce special laws for that along with UBI. Problem solved.
Alternatively though, if that turns out to be too complicated with too many side effects, I think there is a good chance that UBI leads to people being able to spread out more evenly, away from expensive and dense cities. You tried to make an argument why this will not happen, but as explained, your argument is not conclusive.