"Convoluted" is one word for it. Some other words are baffling, nonsensical and dishonest. The definition of "generation" provided in the Feb 15, 2008 WT does at least bear some similarity with what the dictionary says. The dictionary says a generation is "all the people born at a particular time"; that WT says it's people who share "a common experience during the same time period". Well ohhh-kay ...it's a bit of a stretch, but we're with you so far, I guess.
The April 15, 2010 WT then stretches this further by saying the generation "usually refers to people of varying ages whose lives overlap during a particular time period". Sorry, but at that point they're contradicting what the dictionary says. My father's lifespan overlapped mine, but his generation was sure as hell not the same as mine. F.W. Franz, referenced in the convention talk, was born in 1893. That was 117 years ago. I think it's safe to say his generation has ended.
The strange thing is the way the speaker, around 3min 40, declares that the "generation" Jesus spoke of in Matthew 24 "comprises two groups of anointed Christians". He repeats the phrase for emphasis. The two groups are (a) those who were alive in 1914 and (b) a later group of anointed who for a time were contemporaries of the older group, in the same way, I guess, that my father and I were alive at the same time. This, of course, is a complete invention and achieves this by taking a further step away from the already dishonest use of the word. Where in Matthew 24 is there any suggestion of two groups? Jesus speaks of "the generation", not "two groups of anointed". And yet the speaker says some in the "second group" would be alive to see the Great Tribulation and claims the Bible says this.
Here he supports his claim with an illustration of Fred Franz. He suggests that because Franz's generation overlapped the lives of other anointed, they are all in the same generation. Does this make sense to you? Franz died in 1992. If my daughter was born in 1991, and therefore 19 today, would she be the same generation as Fred Franz? This is just wrong. It's a fiction, an invention, just dishonest.
Two final points: Curiously, the 2008 WT says that Jesus' words did not suggest a formula to enable them to determine when the last days would end. But that's precisely what the Watch Tower Society has always tried to determine.
And why does the audience applaud when the speaker announces the release of a new video? Why did they not stand up as one and say, "Hang on! None of that made any sense! Can we sort out that last piece of crap before you start handing out presents?" How many of them would have walked out of the convention that afternoon thinking, "Yep, got it. That made complete sense. I can explain that no worries." They would instead have been practising their beaming smile and ready to spout those immortal words, "That was so uplifting! So encouraging!"