"North" IS by convention. I've been saying this all along. It has nothing to do with any map. The place we call "the north pole" is north because it's been defined that way for ages. Apparently the origins of the word have to do with Sun, but the effect is the same, because it points to the same place on this spinning ball.
Ah but that's my point, turns out north is not a well-defined concept contrary to what I thought first.
That quote is ambiguous and could be interpreted as "north is where the up on the map is". And actually there seems to be no better definition (that eg. would stand the flip of axis). What are we arguing about again?
North IS a well-defined concept. From the most ancient times, people knew where north was: it's 90 degrees left of east, and east is where the Sun rises. Go back in time 5000 years and ask anyone where North is, and they'll point you to it, long before any modern maps of the world were ever made.
Wikipedia having one poorly-written line about it doesn't change tens of thousands of years of human history and knowledge about where north is. Wikipedia isn't even an authoritative reference on anything.
You quoted it, but you don't understand it.