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óÑgÅìnA·MÀæíI¨;L¸Yes and no. Basically the old benefit of 51% is "few confirmations" accommodating a split for a double-spend. With Avalanche, network control can cause a sway. But remains _not_ split.
https://whatsonchain.com/tx/7ccbb8e41ac13ba8ab28c84460a971c44f1c1a7f86cffbc69df8e4f6227b3ffb