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"Science proves veganism is right."
They make claims about the body or nutrition that the evidence does not support. When they fall, they take the speaker's credibility with them.
Why it is weak
Science answers questions of fact, such as whether animals feel pain and whether a vegan diet can be healthy. Whether it is right to cause that suffering is a moral question, which no study answers on its own.
It is the same mistake as saying "veganism is opinion, not science", in the opposite direction: it confuses facts with values.
How to say it better
Science shows that animals feel and that we can live well without exploiting them. Ethics, with its own methods, shows that causing unnecessary suffering is wrong, a principle almost everyone already accepts. It's the combination of the two that supports veganism.