Thanks for the replies. :)
I did a little bit of digging myself although I don't own any original bound volumes anymore.
I started with this website and looked for anything relating to 'generation' that has been posted and commented on using pre 2000 WT as a reference.
It looked to me like the originals had not been altered (yet) regarding this particular topic. But it was a small sample size as I only referenced a handful of articles on the topic.
Like the Reasoning book, which is still available on JW org, the pre 2000 WT's that I researched, notably, the 1984 WT - the generation that will not pass away', still maintain that 'the generation' are the group of people alive in 1914 that will not pass away before Armageddon.
So, officially, as of this date, the org is promoting 2 different doctrines on the same subject. I don't really think any reasonable person would call that being 'faithful', or 'discreet'.