After finding and downloading two files that claim to be both versions of the Driver 2 demo in
https://archive.org/download/PlaySta...meplay_Riku911, then finding out that both are actually the same file with the ID SLUS-90093 and without the missile shown in that Youtube video, now I guess the demo with the missile in the then-future place of the secret car may be the SLUS-90094 (which means that the Driver 2 demo rom found in coolrom is the 90093 one), which cannot be currently found anywhere to download.