I can't believe someone would say that, especially a MW, who's supposed to be an authority on these things! Totally agree with PP above that any personality expectations can be projected onto your baby when they're born.
I am 21 weeks and have a very wriggly baby, even with an anterior placenta I can feel it really strongly an awful lot of the time, all over the shop. To the extent that the sonographer remarked at both scans that it was an exceptionally wriggly baby. One whack woke me up at about 19 weeks, and on other occasions I've seen my tummy physically 'jump'.
I have made a huge effort to not project strong personality traits on the wriggler. I refer to it as Baby Bear as we chose not to find out gender and it's a gender and personality neutral phrase. When I get kicked and pushed and somersaulted, I see it as baby saying hello or trying to make contact.
My mum recently told me that when I was in utero, she 'knew that I had a temper' because when she would grab my foot, I would kick back until it was released. As a child I was stubborn and, yes, had a temper and became known as an angry child by other members of my family. But it's impossible to know if I would have had that anyway, or if I developed that because that was what my parents projected onto or at the very least expected of me. Now, I'm (usually - I have my moments) renowned for my calm.
It's been proven by gender neutrality studies and sociology studies that the way someone is treated can have a profound effect on how they actually behave - if everyone in the office told someone (who was really perfectly fine) that they looked ill, quite often that person will eventually agree that they feel under the weather and actually become ill. Equally, when children treat the nerdy kid in the class as if they're the most popular, that nerd becomes the most popular kid.
So I'm choosing to see this 'wriggly baby' of mine as a baby that is looking forward to getting out and meeting us, and someone who hopefully will join mummy and daddy in outdoor pursuits. If this is wrong, that's fine, but at least I'm starting with a blank sheet of paper, not one with the word 'angry' listed in the personality column.