It's an odd opinion piece, since nothing in bill C-16 says anything about pronouns.

There isn't a chance in hell that refusing to use certain pronouns would violate the hate crime provisions of the Criminal Code.

I suppose I can imagine a situation where a transgender person might win  a Canadian Human Rights Tribunal case involving an aggressive, in-your-face refusal to use certain pronouns, but it would have to be an extreme situation.

The Canadian Bar Association has a short (4 page) position paper on C-16; it's worth reading.  A link to it is here:  
https://www.cba.org/News-Media/News/2017/May/CBA-position-on-Bill-C-16