Only this club change style does not prove that Cristiano Ronaldo is a loyal player and he did not move to another club in a same league because of his loyalty for his club. It can be because of his loyalty or can be not, I don't see there is enough evidence for a sensible conclusion.
It is clear that he is a loyal player. Why you doubt his loyalty?
You may see it on your point of view as the hater, but I don't see something to doubt his loyalty in my perspective.
If he isn't loyal to his previous teams, he will move to the rivals. But he never did this, he always moved to another league. For me, it is enough to prove his loyalty.
I see one big interesting fact, that Cristiano Ronaldo plays for strongest clubs in leagues like Manchester United in Premier League, Real Madrid in La Liga, Juventus in Serie A, so it's hard for him to move to another club in a same league. Perhaps he did not have too many choices in a same league, and he also wanted new challenge, so he moved to another league.
Man United and Real Madrid may be 2 strong teams but it doesn't mean they always win the competition. Ronaldo makes Man United and Real Madrid be the strongest team in his era. Meanwhile Juventus, was clearly not the strongest team when Ronaldo joined it. Inter Milan becomes the strongest team at that time.