Yeah, but they're not able to choose whether they do that. Big difference. Ants come pre-programmed in how to do those things. To say that's the same as agriculture is bullshit. It's not the same.
It's a completely different category of phenomena, to tell the truth, and any superficial similarity to human agriculture is just projection. Ants are pre-programmed to take those certain actions to farm the aphids. We are not. there is no built-in code in a human that tells them how to farm wheat or chickens. Most likely, the ant-farming is just a re-purposing of built-in ant programming for tending to larva. They just see the aphids as a different type of larva, not a farm animal: so the "farming" by ants originally came about due to a point-mutation which caused caretaker ants to confuse aphids with larva. The fact that it was beneficial was just a fluke.
The fact that this resembles deliberate human farming is only superficial, in the same sense that the sun's rays being refracted by the upper atmosphere explaining why the sky is blue doesn't mean that all blue things are explainable by the same explanation. Things are colored blue for different reasons, even though the outcome is the same in all cases. Ants farming aphids and humans farming crops/animals both happen for completely different reasons and by entirely unrelated mechanisms. It's like saying the sun isn't special because it's round and apples are also round, and apples aren't special.
What we definitely do differently is "memetic evolution" vs "genetic evolution".
I can come up with an idea for a snail farm, and I can tell you about it, make up how it's going to work, then you implement those ideas. Ants can't do that.