Microcephaly is a characteristic or feature rather than a specific condition or congenital birth defect.
The individual in this video definitely exhibits microcephaly, which could be congenital or the result of developmental issues (including factors as prosaic as injury or malnutrition at a critical time of prenatal / postnatal life).
This particular individual has been illustrated on the 'Net for some years now. As far as I can tell, presenters tout him as extraordinary owing to the combination of obvious microcephaly and relatively large size.
This combination would seem to argue against his being a specimen of the sort of classic congenital 'pin head' known from (e.g.) Freaks. That doesn't automatically make him a human / non-human hybrid.
Frankly, I don't see anything about him that places him outside the range of congenital / developmental anomalies known to medicine or even my personal experience.