Given that his wife has applied for PR for him through family reunification once she has been granted PR as a protected person I can't imagine he can convince someone he is a temporary visitor.
There are likely many factors which will have influence in how a visitor visa application by
@hemin979 will be decided. Too many factors for anyone, including you or me, to reliably offer an opinion about what the outcome will actually be.
We can identify general principles and offer general observations about how certain factors can influence such matters, including illuminating particularly salient factors and generally (as in, NOT in the particular case in question, but typically or commonly) what influence this or that factor tends to have.
There is a huge difference between recognizing general principles and how certain factors can influence IRCC decision-making, in contrast to reaching definitive conclusions as if this or that factor will alone determine the outcome.
While I explicitly cautioned that the query could be better answered in another forum where such matters are the subject of discussion (and I again suggest posing the query in a more appropriate forum),
it warrants further cautioning that even in those discussions any declarative prediction of outcome should be considered highly suspect. No one at a site like this can provide a reliable opinion as to the outcome when the outcome depends on numerous variables. Which is to note that even in those forums where participants are more engaged in these particular matters, personal advice (such as to how it will go in an individual case) should generally be dismissed as suspect or, at the least, given very little weight.
Information is far more valuable, in a venue such as this, than judgments or conclusions.
Best to stay close to what is known.
What is known is that Foreign Nationals are NOT precluded from obtaining visitor status in Canada just because they have immediate family living in Canada. What is known is that FNs are NOT precluded from obtaining visitor status in Canada EVEN if they also have an intention to stay permanently in Canada, under policies recognizing DUAL INTENT.
BUT it is also well known that FNs who do not carry a visa-exempt passport can find it very difficult to obtain visitor status unless it is well-established they will likely comply with immigration rules (such as leaving Canada timely) and have home-country ties sufficient to strongly support the inference they will in fact leave Canada to return home TIMELY.
Beyond that there are many additional factors which can and likely will have much influence. Too many for anyone here to genuinely offer personal advice as to what the outcome will actually be. Some guessing is sometimes illuminating or even instructive, especially when bolstered by a citation of reasons. But guessing should be easily recognized for what it is, a guess (I do a fair amount of guessing, but hopefully I telegraph that it is indeed a guess, and whether it is an informed guess or a not-so-informed guess).
I referenced an additional factor which could be of significant import for the OP: immigration and travel history. There are additional factors.
In some situations I might suggest consulting a lawyer. But in this situation the cost and effort to make a visa application is not onerous. And a lawyer cannot change the facts. So there is little reason to go to a lawyer about this.
A separate, important factor: There is little or no disadvantage to making the application beyond its cost and the effort.
