It briefly shows one person saying that their grandma said it. There's no suggestion that any particular claim about Cleopatra's appearance is endorsed by the documentary as definitely true. In general, as I'm sure you're aware, it's misleading to say that a documentary "says X" if X isn't a claim that the documentary itself is endorsing.
> they could at least show a bust of her
Are you sure that they don't? This is just the trailer.