This may have been specific types of lag to be fixed rather than quelling all of Minecraft's lag. But I see what you mean; the lag isn't exactly improved.
Well it is very true, however this does fix lag issues for the high-end computers with all these fancy big graphic cards and these octo-core processors. It fixes lag for them, however it doesn't fix the lag for people with moderate or low-end computers it only makes it worst because sometimes what developers do is that they make the graphic card or processor work even more than it was before. So yeah I have a moderator computer and sometimes it doesn't workout well for me.
Again, I love being the odd d00d out, who can barely summarize what's going on. Though, my point still stands.