When a region as small as Europe is getting three, or four or five depending on the topic, civs in an age while other regions like Sub-Saharan Africa or the entirety of the Americas have only one or two civs in an age, then yes that is overrepresenting them.
I'm tired of Europe taking up half to a third of civs in every civ game. Civ 5 had 17 out of 43, about 2/5 of civs were European. Civ 6 had 16 out of 50 European civs, nearly a third. Civ 7 finally strikes that balance of treating Europe just like it treats the rest of the world, 7 out of 31 in the base game, even still overrepresenting them with giving them an extra modern age civ by leaving out modern age Middle Eastern representation, and suddenly people are mad.