I can't say for certain, but it's been a month since this thread was bumped prior to your post, my guess is that if people were still getting banned they would still be complaining.
I don't think it's possible that multiboxers stopped doing battlegrounds entirely, there's new multiboxers every day and certainly not everyone has even heard of a possibility of getting banned from battlegrounds...
My guess is either that they changed some parameters on their end in a server update and that it's harder to get automatically banned by this system, or that they turned the automatic bans back off for now.
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