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You cannot draw that conclusion from that one article, particularly when the article says explicitly, "... and is outside the scope of this Position Paper." Presumably they either have, or will be, writing more specific guidelines for children and pregnant women on plant-based diets, but so far this is what I've found on their paper on nutrition benchmarks for children:

"Some children may also require dietary modifications for certain cultural or religious preferences, including vegetarian diets,4 which may also have added benefits. A recent study of one child-care center in South Carolina found that adding vegetarian meals to the menu improved the nutrient content of foods provided while keeping total energy, saturated fat, sodium, and cholesterol relatively low.11"

To read that paper and infer that it's claiming plant-based diets are unsafe for children and pregnant women requires such a thick degree of bias it's just desperate. Especially in the context of every other health authority around the world affirming that a properly implemented plant-based diet is safe and adequate for all stages of life. You really need to take a look in the mirror and ask yourself why you're trying so hard to lie about this.