Not quite...
It's better to try and prevent an undesired behavior from occurring rather than allowing it to occur. If it doesn't occur, then it can't be rewarded in a negative or positive manner.
Many people are all "gung-ho" about ignoring bad behavior and reinforcing good behavior... but often times, it takes more than that. It's not always that simple. The best way to stop an undesired behavior from occurring is to prevent it from happening in the first place. That is, setting the bird up for success.
Here's some good blog posts by Lara Joseph.
A Quick Example of How Positive Reinforcement Can Help in Preventing an Undesired Behavior | Lara Joseph
Unknowingly Punishing Desired Behavior | Lara Joseph
Putting Behaviors on Cue?Knowingly or Unknowingly | Lara Joseph
So in your case, with Ciry, rather than punishing or being negative to her about her pooping when she is on the sofa, you should instead figure out how often she goes and every 15 minutes or 45 minutes, take her to her potty area and have her go there. She should be potty trained to go in her cage and where-ever else you want her to go.
If she ends up going somewhere where you don't want her to go, it's not her fault. It's yours. It's yours for not making sure she was in the right place. You need to be more diligent on making sure she goes where you want her to go. She doesn't completely understand that she's not supposed to be doing what she is. Even though parrots are capable of human speech, it's often just them parroting us unless they learn the meaning behind the words. Many parrots don't.
In the case of chewing on something she shouldn't? Prevent her access to those items by keeping her away from them or covering them up. Give her things she *is* allowed to chew on and reward her for playing with those items. Punishing an undesired behavior may make an animal try to be sneakier when it comes to doing the behavior you don't want.
An example? A dog has an accident in the home. If you punish the dog for going inside the house, then you may be teaching the dog to go in more remote areas of the house so you can't see it, or maybe teaching him to cover up his mess. You are not rewarding him for going to the bathroom where he should - i.e. outside or on a pad.
Does that make sense?
And speaking of dogs... well, I've got a quirky example using my own dog!
With my dog, I have a pretty simple solution that I came upon by accident! I "beat the crap" out of him before he gets to go back inside! I have an 80lb akita mix, and the best way to prevent him from going inside the house is by making sure he goes to the bathroom before he goes back indoors. The easiest way to ensure this? Get him really hyper and excited so he has to run around the entire yard! This results in him having to go to the bathroom... how do I get him all excited? Using my hands, I slap or thump his sides and rump. I don't know why, but he likes it... (he gets that doggie smile while doing this! and he comes back for more!) and it gets him all excited... and then he runs around in circles and eventually goes and takes a dump! (hence the phrase that "I beat the crap out of my dog"

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He is then inside for 10 or so hours with no access to the outside and he doesn't have an incident inside the home! I prevented undesired behavior with him by ensuring he did desirable behavior before he could do the undesired one. There are times that he still has an accident in the home, but this is more because he has an upset stomach and can't hold it in. If that occurs, well, he tries to go
in the bathroom. I don't know how he picked up that the "human potty room" is a better place to have an accident in the house as compared to any other place, but at least he tries!
