This makes very little sense, unless the 4-pin XLR power l ads are not connected to the same side of the DC to DC power supply as the Vlock battery contacts. If they are both connected to the same input, then using the same size Vlock battery D-Tap or connecting it directly to the camera would be the same.
However, if the 4-Pin XLR is in a 12-VDC tap on the power supply, then BM's response would be valid. In any case, I would error on the side of caution, and follow BM's recommendation, and stay with a regulated 12VDC connection to the XLR power input, else the warranty could be voided.