The judge isn't following Ontario laws, it says right there:
"Who is responsible for reporting a child in need of protection?
Anyone who has reasonable grounds to suspect that a child is or may be in need of protection must promptly report the suspicion and the information upon which it is based to a CAS."(Doesn't say people have to be qualified/certified or must speak with the family involved or doctor).
"What are "reasonable grounds" to suspect child abuse or neglect?
It is not necessary for you to be certain a child is or may be in need of protection to make a report to a CAS. "Reasonable grounds" refers to the information that an average person, using normal and honest judgment, would need in order to decide to report." (Daycare providers have experience meeting daily needs of children. We have the common sense to identify if a child's well being is at risk. Plus it's better to be safe than sorry.)