This is true but only until you reach another planet or in orbit returns (in every "big" load of transition zone). For work again you must save the game, closed the game, run the game again and load the save game.
I was cheked and work, is not the better way of play but you can make a lot of money in solar system with a space station and move planet to planet to find an ambush of pirates, pik-up the lot and sell in the space station without need save, exit, run and load and is cheaper if you only use beam weapons, not missile or roket.
If you land, take-off, dock or jump to other solar sistem or galaxy, the cheat do not work, every time the game load data (the blue bar raising in the down of the screen) the engine must load something that cancel the cheat. You must save the game AFTER the load of data, quit the game, run and load save game and work again. The little load between the ship and the planet or the door in the building don't affect the cheat.