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Flybywire. I'll accept that the NTSB is correct, but I had seen it reported that he did not make a MAYDAY call and I certainly cannot make out a distinguishable MAYDAY call from the cockpit recording. Its all in about the first 12 seconds of the youtube video. A garbled section is at the 4 second mark, but it doesn't seem long enough to contain the word Mayday once, let alone 3 times.
On this basis, I'll continue to contend that the controller acted primarily out of an comprehension of the situation rather than hearing a declaration of MAYDAY.