the Somali language can not be used to translate the hieroglyphics lol, the Egyptian Coptic language was used to translate it
You can reconstruct genetically ancestral proto-languages based on the comparative method by using a net of diverse linguistic offshoots as the landscape for source material for back-tracing. It requires a basis of enough firm data.Fake news the guy just said Somali and Ancient Egyptian are in the same language family and he put 'translate hieroglyphs'
That said I think it is possible to get some meaning from the hieroglyphs using Somali- Somali seems to have retained more features of the original proto-Afro Asiatic language and the number of identical roots and or similarities is a lot. Some words that are identical after millennia include the word for 'foot' 'biito' - this is old Somali only found in children's games.
This is also why you have very ancient cognates with Arabic not due to recent borrowing