you can't be serious with that statement that's beyond ridiculous, sorry but it's just true
also, we are talking about the Matrix demo here, which barely streamed any data, only a few megabites even during fast traversal.
I can confirm this first hand as I literal ran the demo on my PC on a 2.5" HDD that I took out of a PS4 Pro, and there was basically zero perfomance difference and drive usage was pretty tame.
only the initial load took like 5min, after that load, basically minute differences between that drive and an SSD.
data streaming is not a factor in the performance of that demo.