Not sure what your point is posting those pages, but it seems to be generally accepted that dim sum culture, even though the words dim sum might not have been used, started long ago in tea houses in Canton, then spread and evolved from there. Of course there have been changes over the years, that happens with all food cultures and languages, and I think we can all agree that the Chinese people are remarkably adaptable when it comes to locally available ingredients and tastes.
Case in point, I found the Greek cookbook. The author uses a slightly different word for dolmades. I don't remember what it was, but the spelling was a bit different. There was also a recipe that seemed to be the lalangia mentioned in the Greek thread, but, again, the spelling was different, actually quite different other than beginning with an "l". That book is about 30 years old.
I also have a book from my mother that is pushing 80 years. It was given to her as a young bride. There are instructions on how to put together a pantry, how to set the table for a casual family meal to an extremely formal event, how to instruct servants on preparing and serving meals, how to set up a root cellar, build a smokehouse, canning, preserving, etc., plus all kinds of recipes, some of which use ingredients most people wouldn't touch with a 10 foot pole today, but people used regularly back then. And for an example of the reverse, lobster in the US was once considered a by-catch and basically trash. It went home with the fishermen for their table because no one would buy it...
Food, just like language, is fluid and constantly changing. Visit a dim sum restaurant or look up a menu on-line for one and you'll see all kinds of things on the menu for dim sum, not just dumplings.