Unlike you, I am a lawyer and familiar with Canadian constitutional law.  Read "R. v. N.S.", where the Supreme Court explicitly found that compelling people to remove their niqab is a violation of freedom of religion, and said that in the a courtroom context it could be infringed upon only if it threatened the right to a fair trial for the accused.

So yeah, requiring a woman who wants to ride the bus to not wear a niqab is absolutely an attack on religious freedom, and one the courts will strike down in short order.