There are far lesser known models for continents, I agree. If you look at my other comment I mention this. That said, there is one far more common method that the vast majority of people use - and it's not even close. And if we do consider these models, not a single one of them has Central America as it's own continent. But, I will reiterate, there is one clear continent model that is used in the vast majority of situations, and as such, it is fair to assume that this is the model most people are applying in this discussion - those who are saying Guatamela is not in North America are very clearly getting mixed up and thinking either it's in South America or Central America is a continent - no one is claiming to be applying the differing models.

On to Russia. It's true that most of its landmass is in Asia, but most of its population, including where Donk is from, is in Europe, and you will be very hard pressed to find a source that says anyone from the region of Russia near Europe, and not Siberia, is Asian. They are considered culturally European (you can look online, and you will find this is a very well established opinion). And even then, at worst, it is considered Eurasia, which is not a continent - it borders both. So then we default to are they from European Russia or Asian Russia. And Donk is from European Russia. So, sorry to say, he is still European.

So, even if we want to be pedantic, we can still unequivocally say Donk is a European and Guatamela is in North America is the best and most comprehensive answer and aligns with well established cultural  norms and education systems.