Compensation is not cure
An indemnity policy is a contract to pay if a specified bad thing happens. It does not change the lease, it does not bind the landlord, and it does not oblige anybody to put right what is wrong.
That is enough when the defect is unlikely ever to bite and the only cost is transactional friction. It is not enough when the defect is one somebody will have to live with — a missing right of access that you need, an insuring arrangement that cannot fund a rebuild.