In that case, I'd say the advantages do sound unfair but I'm not willing to delve into that debate. I honestly don't care enough about parses to wanna die on this hill.
It still gives you an advantage since a person can get distracted, can panic and forget stuff or mess up, etc. but a program doesn't. No one said Cactbot plays the game for you or makes it so mechanics don't matter or you don't have to pay attention, just that it gives an undeniable advantage by removing the possible human-error factor when it comes to making call-outs or noticing mechanics for yourself (sometimes apparently going as far as telling you what to do).