Brownian motion (Gaussian distribution) is not random if someone can track the movement of every molecule and their interaction with every other molecule, using Newton's law, that someone can then predict and track that molecule's movement exactly.
Casino use a chip that generate random number (technically called a pseudo random number generator) to set the slot machine payout. Those random numbers are strictly speaking non random if you can get a printout of the random number series prior to installation.
The same argument applies to stock price. %%% Not a prediction, but a calculation.


Have a good trading day
@murray t turtle. You gave me lots of ideas to contemplate. Thank you.