Maybe I mis read the info on the T2 buffer

"The Spike's Tactical ST-T2 Heavy Buffer is one of the softest shooting, smoothest and quietest buffers on the market not to mention it looks awesome. It doesn't have any weights to move around or fluids to leak out, it's 100% maintenance free!"

I know when I was trying the 9mm buffers of old, they were solid and induced lots of bolt bounce. If the T2 doesn't have any weights to move around, how does it counteract bolt bounce? Or is this just bad info on the T2?