It doesn't look like a new frond - one of which is already present. How long has the "problem" one been visible ? Last year ? It is quite hefty. If it isn't stopping new growth from the crown, I'd do as advised and leave it be. If you think it is stopping fresh growth, cut it off.
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If it isn't stopping new growth from the crown, I'd do as advised and leave it be. If you think it is stopping fresh growth, cut it off.