Welcome to the board. Both my brother in laws had 850T's back in the 1980's while I was riding Japanese bikes. One had an 850T and the other a T3. A friend I rode with in the early 90's had a T5.
As for the highlighted point,well dismiss it from your mind. My 2000 model is stable as a locomotive on our Aussie roads and I know what a full blooded tank slapper is like on a GSXR1000 on the straight at Phillip Island at 200kph with the triple clamp hitting the stops in both directions.
There are plenty of people here on this forum with many.many miles on red framed bikes that will tell you they have never experienced an issue. Why Guzzi did what the did with the later bikes is a mystery. I suspect they moved the flywheel guy to the frame department around that time.
Buy the 2001 bike and have some fun.
Ciao