I may be wrong and I have not checked, but I think Miriam Stoppard's doctorate is in chemistry, and she is not a medical doctor.
So she has a science background, anyway, and should know how to research and evaluate evidence.
The thing about teeth: there is no evidence that bf should cease because of teeth. Teeth are indeed useful to chew and bite and chomp and the usual age of getting them - about the middle of the first year - is a clue that speaking generally, babies can manage other foods than milk at that time but they don't need to stop breastmilk. Babies get teeth across a wide range of ages anyway - some are born with a tooth, some don't get any until a year. So it's too variable to use as a guide in every baby.
Presumably, MS knows that babies with teeth do benefit from milk and they don't go suddenly to needing all solids and no milk - so she would prob agree to keep on the milk. Why on earth would that not be human milk? Why would it have to be milk from another species?