"Anyone can follow a vegan diet – from children to teens to older adults. It’s even healthy for pregnant or nursing mothers. A well-planned vegan diet is high in fibre, vitamins and antioxidants. Plus, it’s low in saturated fat and cholesterol. This healthy combination helps protect against chronic diseases.

while it’s true that page says exactly what you quoted, it also says

Speak to your doctor, healthcare provider or dietitian about a vegan eating plan

which is pretty critical, considering basically every source you linked spends most of the time explaining the common nutrient deficiencies found in vegans and ways to mitigate them.