Blockchain has a lot of distinct advantages when things need a very clear audit trail. Auditors love the fact that a block can't be modified without recalculating all subsequent blocks. Of course, in a blockchain controlled by a single private entity, the entity could redo all the blocks, but that's not really the main concern. The concern is to try to prevent rogue individuals from modifying the ledger without detection, and that is harder to do with blockchain than plain DB access controls.
Come on, it's not difficult to see how those DB solutions are easier to modify after the fact without detection than a blockchain-based solution, and blockchain-based solutions are generally easier to make distributed while still guaranteeing immutability.
