It would be even more impressive if it were correct!
- Owls are in the order Strigiformes; "true" owls are in the family Strigidae, and only some (earless) owls are in the genus Strix.
- As for size, https://largest.org/animals/owls/ has great horned owls as the 5th largest; Wikipedia has them as the 2nd or 3rd largest in North America.
- Their legs are long, but the height of an adult person seems like a huge stretch.
Elf owls are adorable though!