That someone is true. Simulation programs use ideal component values and do not pick up distortion from the outside world and physics. Although they can give a good insight in how a circuit works. If you see currents of thousands of amps you know your circuit it not working if you only wanted 1 amp. If you simulate 1 amp and build your circuit it could possibly be true that it is somewhere around that 1 amps but not exactly the same as the simulation.