A robot can do only what is programmed for. So if it's programmed good (and the settings are good) it may do better than you would do. Where it can do better than us to do more operations faster.
But the problem of the "robots" is that they cannot think. Even AI learning is pretty incipient. So you cannot rely on that. The robot has to be programmed good and set up properly. And this is its main weakness.
If you don't know how to analyze that data yourself, if you have no experience in doing that, you may set up wrong the robot, having it under-performing.


“A computer lets you make more mistakes faster than any other invention with the possible exceptions of handguns and Tequila.”
― Mitch Ratcliffe

I believe what you have heard is something about "trading bots". in which case I give it a 90% possibility that what you heard was from someone advertising a bot in order to make money in case you bought that program. and that has been happening a lot lately because there are currently trading bots that pay people who "refer others" and unfortunately this has turned into a fake advertising competition with lots of false information.

part of it is true though. for example a program (aka trading bot) can take some data from exchange APIs and do a quick analysis on it. which is just a bunch of calculations which the programmer programmed it to do. and that can be a lot faster than you looking at your screen and opening up a calculator to do the same calculations. but don't mistake them for programs that can make you money just because they can do such "calculations" fast.