The reason there was no growth chart posted for the V2 is in fact explained in the Index post that you quoted. It's supposed to be a list of links to topics and replies that were posted on TamaTalk. A complete, finished and accurate V2 growth chart was never posted on TamaTalk, therefore we did not post a link to it
At least, that's the way I remember it. I remember that I personally looked through many, many, (many) posts on TamaTalk searching for good quality info on growth and character charts and that it took me a long time to prepare that list of links.
It's quite a few years ago, so I might be wrong!
Growth charts for the various versions of tamagotchis were posted on TamaTalk and on other popular fan sites (like TamaZone) mostly by members who had spent a lot of time and effort keeping track of generations / evolutions / training, etc. in order to help us gain insights into the programming rules for each character and version's growth.
The V2 was launched with a lot more possible characters, more coding, shop items and games than the V1. I remember there were plenty of people trying to figure out the evolution and many growth chart projects were started. BanDai only released character charts at the time and left the evolution and growth for the fans to figure out for themselves. That was part of the charm actually
However, this was at the height of the tamagotchi's popularity and BanDai launched the V3 and the V4 / V4.5 in fairly quick succession after the V2 and so interest and emphasis shifted onto the newer versions and so many of the projects stalled and were never completed.
The V2 growth chart posted on TamaZone by OsuMesu21 is a good one and although I have never had enough time to check it for absolute accuracy I think it's probably one of the best you'll find.