Well this is a nice surprise!
You are referring to this post right?
I suppose it was deliberate to make the wording vague so as not to make an actual statement that could be refuted (or are they just stupid). Or perhaps if the wording was convoluted enough the Society was hoping it would never have to take it back and make up a new one.
It is a combination of both I guess. It was so confusing many witnesses don't even know about it until you point it out. It was not announced with trumpets blazing as new light. It is a bit sneaky and brought like a refinement of terms instead of the abolishment of an entire doctrine.
But I do have one question. Did the WBTS officially deem the subject new light, or did they try to say that it was meant that way the whole time?
From the start on they used 'this generation' as a promise that armageddon would be arriving soon. Russell gathered it to be around 30 years. They had to update this around 1944 ofcourse (1914+30).
Then they defined it as being the average age of man being 70 or 80 years ending in 1984 and 1994. There was some excitement in 1984 but nothing happened. 1994 nothing happened as well so they had to redefine it again. Defining a generation of more then 80 years would be plain silly. So they invented this strange cop-out that anybody that knows what happened in 1914 belongs to 'this generation' stretching it limitless.
On a side note: they played around even more claiming at first one had to be at least 15 years of age at 1914 to belong to the generation, then it became 10 years and later 0 years. I do not have the references now but can provide them if you wish...or maybe another poster has them at hand...
Greven