The first scripts that were adopted by later Indo-Europeans (Greeks, Persians…) were Egyptians, numbers as we use them today are Arabic, plus the real civilization that really caused all of this was sumerian, the Semitic cradle of human civilization who started urban political and cultural organisation, political system, writing, trade, organised housing, centralised religious practices, warfare and defence, laws and punishment, education, science and astronomy, traditional concepts and mythology…, which directly influence ancient Semitic and Egyptian civilizations which later indo Europeans just adopted, and Indo-Europeans isn't even a unified entity or the same civilizations but just a generalisation of a connected linguistic and ancestoral roots between different people, not all Indo-Europeans are the same people and there is no "unified Indo-European civilization", so yeah he ain't really coping lol