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Hmm , you had to dig pretty deep to find that worry .
This is the first time in close to 60 years of cycling that I've heard or read about anyone concerned about crushed ankles .
Gotta love being alive ... something new , every day .

Me too. Never heard that mentioned before.
But,..to prevent it?
Don't let your 900 pound Goldwing fall over in your driveway with your foot under it.
(been there, done that)

 

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Everyone is different, some need to start on a small bike, others do fine on a larger one. A VZ800 is mid sized, mid weight, slightly above average power but not crazy.
My Daughter learned to ride in a day on a VZ800, she rode it for about a year then sold it and bought an Indian Scout.

Ha! When I started riding in the late 60s, an 800 was a BIG bike!
After 6 smaller bikes, I eventually graduated to a BMW 900 in 1974.
I rode that bike for 30 years. Never thought it was small or even mid sized.
Now, after riding the Goldwing for a few years, that BMW would feel like toy.

 

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A dude that used to work where I do got a brand-new Harley Wide Glide when they came back out in 2016(?). Within a year he was less one leg.
Got T-boned by a woman that didn't see him. I never heard the actual story, but I knew he rode like a set of buttocks and wasn't surprised by his accident. He was trying really hard to be a "biker".
Moral of the story? Don't ride like a set of buttocks and you'll probably be ok. Probably.

LOL!!! Good advice!!
You can ride very fast for a short time.
Or, you can ride slower for a long time!