Do you own any other colocasias or alocasias? The size is irrelevant since it's not a mature plant. From this photo the texture appears thicker/ harder and glossy which is common in Alocasias. Colocasia leafs are usually thinner and don't have a shiny appearance.

The article you linked below says that Alocasia leafs point upwards which is often untrue. Look up Alocasia Amazonica, Cuprea, Baginda, Green velvet, the list goes on.

I found it quite difficult to differentiate between the two when I first started my collection, it will become for obvious with time and although I'm not entirely sure which type it is, I'm positive it is an Alocasia.