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placement blockage and halo used to block other cell like standard cell or other macro to be placed in that area. So both placement blockage and halo have the same functionality.
THe different between them is halo stick with the macro like EBB. If EBB move, the halo move with it. But placement blockage will stick to the same location which you have defined for them. So for summary, halo move with the EBB movement but placement blockage location will remain although your macro move.