I can see that, and I mean no disrespect, but you shouldn’t have attempted to comment on this topic authoritatively and police what others say without understanding it.
> I don’t really get your point in trying to make distinction between a copy or a “master”(?) or whatever.
You have clearly and repeatedly demonstrated that you don’t understand what “distribute” and “redistribution” means to copyright law. You claimed others were confused about it and that using the word “redistribute” was incorrect, when in fact it was fine and correct.
I’m trying to help you understand that redistribution is a term that is talking about what happens to copies of a work. The sentence you quoted, and the “transfer of ownership” that you said you grasp only have to do with transferring copies, and nothing else.
The main point here is that when GitHub shows you code, it is transferring a copy to you. That is what GitHub calls “publish” and what copyright law calls “publication”, and by publishing they mean redistribution (because the copyright legal code says so).
Copyright is meant to protect original/authentic/unprecedented expressions, disregarding the medium where they may exist. So I don't really get your point in trying to make distinction between a copy or a "master"(?) or whatever.
What's at stake is the originality of the expression and what kind of rights does somebody else (i.e. everyone but the creator) have (or not!) over it.
Can I make copies of this original expression? (y/n)
Can I use this into a new product of my own? (y/n)
Whether something is already a copy or not does not really change the extent of the rights that you have (unless it's explicitly stated in the license, of course).