Apple gets this spot on by having an icon represent the action actually being performed, i.e., sending some information somewhere. That could be to yourself (a bookmark) to another person, a group of people, or the public at large. It doesn't really matter. Many of the others are trying to represent the abstract concept of "sharing", which doesn't fit the use case at all. That's why those icons don't make any sense.…
Right, the icon really represents "send" or "upload" which to me is correct. The article seems to find fault in the fact that their "share" icon is the opposite of their "download" icon. But to me, if you consider the icon to mean "send" or "upload", then it makes sense that it is the opposite of "download".