Unearthed Arcana: Barbarian and Monk includes a new monk subclass: the Way of the Astral Self.
The Arms of the Astral Self feature says your astral arms are monk weapons:
The arms are monk weapons and have a reach of 10 feet.
However, creating such a character with D&D Beyond shows them as unarmed strikes:
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All bonuses are calculated as if the arms were unarmed strikes (such as the benefit of the insignia of claws).
This would make a big difference, as skills like the Flurry of Blows would work with Arms of the Astral Self.
Who is right here? Can monk weapons do unarmed attacks?