I think he means, aimbots are not perfect. So your accuracy is better than it is unaided, but still less then 100%. Different interpretations of the word "improve" here.
Well, they are supposed to be as perfect as possible. The only reason they are not perfect is due to lag. An aimbot on an Unlagged server with las, larmor, helm, and battpack would be unkillable to the smaller aliens and only as killable to larger aliens has they could deal with his dodging ability.
Anyway, I will work on an aim-analysis add-on to the qvm, but no promises.