> But he is not complaining that we use the Gregorian calendar.

Yes, he is:

>>> Yet this "world" history uses Europe's reference point [of BC/CE] as universal.

It wouldn't make sense to use any other than the Gregorian calendar for this map, and it also wouldn't make sense to mix different calendar systems.

> He is pointing out that is just one calendar among many […]

But it's not. The Gregorian calendar is the calendar in world wide use today. Giving dates in BC/CE is not an expression of Eurocentrism, it simply reflects reality.

You are making bad faith straw-man arguments.

> Yet this "world" history uses Europe's reference point [of BC/CE] as universal.

What in this sentence indicates he think is it wrong to use that calendar? He is saying it is NOT universal. What about that is hard to understand?

> The Gregorian calendar is the calendar in world wide use today.

Again, you are arguing with a straw-man. Please read my comment carefully again. I am not arguing this your statement.

As an analogy, the WWW is the dominant (probably virtually only) form of the internet in use today, but it is only one architecture. There were/can be others, but they failed to gain or maintain traction. A summary from Google:

> Besides Gopher, other historical internet systems and protocols existed before the World Wide Web, including Wide Area Information Servers (WAIS) and the Archie search engine. While the World Wide Web eventually surpassed them all, these systems provided different ways of discovering and navigating information online in the early 1990s.