The article How to Fight Student Vaccine Mandates from GWU! is highly opinionated and overtly misleading in the information surrounding "loopholes" found specifically in Ontario public school vaccine mandates. While it is true exemptions are given to Ontario students who receive a medical exemption from a doctor or nurse practitioner or religious exemption, these circumstances are not only rare, but come with large amounts of time and paperwork on behalf of the parents.
According to ontario.ca, parents wishing to exempt their children from receiving vaccines due to religious circumstances must first inform their local public health unit, watch a video on vaccine education, and complete a form stating their wishes to exempt their child and have it signed by a commissioner for taking affidavits in Ontario.
So, while it is true that some children in Ontario may be exempt from receiving necessary vaccines, in general, it is rare. The article from GWU! also uses highly biased language in calling the mandatory vaccine education video a "brainwashing session," and doctor's who refuse to sign off on unnecessary exemptions "cowardly." Overall, this GWU! article should not be considered a trusted source on the subject of vaccine mandates.