Aokiji can shatter and not be phased by it.
Magellan was in physical pain from Luffy's attack.

Very different responses. Even if there isn't sufficient evidence to prove he's a paramecia, there isn't any to prove he's a logia. But, logia is much rarer and follows a narrower list of characteristics that define an ability as logia. Therefore I'd be of the mindset to presume not until proven otherwise.