Touche! This is one of the big inconsistencies in the existing jurisprudence! What is prostitution? What is sex? I will certainly bet that this question will be heavily contested in the years to come.
There's no shortage of cases in Canada that define "prostitution" quite broadly. As I recall, one judge (sorry, don't recall the case or the judge) said that it was the rental of a body part for sexual pleasure. WTF is that??? On that basis, a MPA definitely falls within performing acts of prostitution. (And that's just for hand jobs. What about pussy slides, titty fucks, blow jobs, etc that we all know happen from time to time at MPs? "By time to time" I mean from opening to close. lol)
I suspect the decision you're relying on about handjobs is the Ponomarev case from 2007, which was completely misunderstood by many (most?) industry peeps. Chisvin J. ruled that a manual release, provided as part of a full body massage, was not illegal. But, if you separately bargain for a release, you would be clearly offside.
This is one narrow decision, from the lowest provincial court (not Superior court). Would you bet your business and livelihood on it?