No, actually. Posters are not that rigid here. A thread can encompass many topics within it, and often does.
Which is what you were doing. I was talking about the OP's argument.
To recap, the OP asks "if the Church is supposed to be for all men in all times and places," then why is the Church "Euro-centric" in insisting on the use of wine for Masses celebrated in places where it's not available?
The obvious answer is because it's available; otherwise, Catholics in these places would have to adjust, which is what they've been doing on many occasions for centuries. Which brings us to the point of Euro-centricity: is it the case that the Church is so? When we look at its early centuries and the period of colonization, we see that it is and not. That's my point.
So, your claim that you were also talking about the OP's argument is wrong. You were referring to multiculturalism as part of evangelization, and thought that I was referring to that as well. You were also wrong on that.