From a practical point of view no, ARM would not cause more damage to a faulted 69 kV class cable. Remember, ARM pre-locates the fault with one or so impulses. This pre-location distance then reduces the number of thumper impulses required to pinpoint the fault.
A paper examining the effects of thumping is Hartlein, R.A, et. al. Effects of voltage surges on extruded dielectric cable life project update, IEEE Transactions on Power Delivery (Vol 9, Iss 2), 1994.