Imagine that some random person other than the Queen walked up to you on the street, at school or in the workplace, or in a government office and demanded that you call them 'your Majesty',  and that to refuse would likely result in consequences ranging from career/financial ruin through to prison?

And that it wasn't just any one individual that could demand this, and that the title did not have to remain consistent from day to day but you had to abide by it, or else?

That is the crux of Prof. Peterson's concerns:  being forced to say something is significantly different than being restricted from saying something.

Bill C16, as written, creates precisely that scenario, and potentially criminalizes someone who dares to question the rationale for the request.  C16 is too open ended and ripe for abuse.