They can request it. Won't make any difference though - like in Cardiff 06, it's up to the home union as to whether they allow the AB's to perform the Haka on the AB's terms but that doesn't mean the home union gets to compel the AB's to perform it on any other terms.
That's all quite correct, Jay. The home union can request the Haka not be done.
I can imagine the equanimity with which this would be met by the NZRU and, in particularly, fans after frothing about the Wales "Haka-in-the-sheds" debacle. The gnashing of teeth on boards was epic. Disrespect and other hyperbole thrown around. The ABs were apparently "extra motivated to belt Wales" by the slight of it, as if they actually need motivation to beat them at Cardiff. I'm paraphrasing some of the discussion at the time.
You and I know that few, if any, home unions are going down that path again.
The fact that the IRB felt compelled to "legislate" the Haka suggests it is ingrained as a rugby tradition.
Personally, I am happy to see it.
Personally, I wish more teams would do what France did and the IRB would get the fuck out of it.