I think it is only bannable if you are in an instance and dropping group/raid and abusing the 1 minute teleport to tag with group but kill out of group...
This is exactly Approach 2A in the post above which denotes level 48+ mobs are when the big XP kicks in. A boxer could do this with the mob to be boosted tagging out of group and the level 60 group following and killing & keeping the boosted character healed. Even faster would be a 60 gathering up a ton of them and self healing tanking until the boosted character tags all at once and and then the 60s AoEs them down (I think someone said they were getting 400K XP/hour doing this).
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