I interpret it not as 'knowing' those techs, but rather the widespread use of those technologies. This is why I think the following should be used:
Iberians: one level of slash, chainmail, crossbow, and offensive
Taifas: one level of slash, leather, bow
French: one level of chainmail, slash, crush, crossbow
English, Germans, Saxons & Vikings: one level of chainmail, pierce and crush
Italians: one level of chainmail, pierce, slash, crossbow & defensive
Welsh: two levels of bow, one level of pierce and defensive
Scots: one level of pierce and defensive
Byzantines: one level of leather, pierce, slash, bow and defensive
Arabs, Northafricans & Turks: one level of leather, slash, pierce, bow and offensive
Nubians: one level of leather, slash, pierce, bow and defensive
Magyars, Cumans: one level of slash, bow, leather, pierce, offensive
Croatians: one level of leather, crush, slash
Lithuanians, Poles, Czechs, western Slavs, Russians, Balts: one level of crush, chainmail
Finns, Lapps, Pechenegs & etc: zilch