No, it doesn't. This situation would be used to display that Smalands aren't OP, which they aren't. Smalland is a ship which performs well in some hands, but not all hands.
The definition of "OP" is more about something which is so powerful that it literally cannot lose. It's more often used in slang to mean "something that's more powerful than it should be", so it's worth pointing out the definition.
Likely a combination of strength as well as popularity, but yes. The base kit of the ship gave it a lot of room to work with, and when played well it certainly stood out.
Skill is absolutely a factor in talking about CV Balance. I'd encourage you to play CV for a Hurricane team, where you will see high-end skill matched against high-end skill. While AA is automated and Fighters are static, they can be employed quite well by high-end players.
I believe you said you did? Something about sniping an enemy CV in about 7 minutes? Then you should be more than aware that a CV doesn't simply pick a target and kill it as easily as is being argued. Literally the thread is mocking the idea that AA doesn't matter... because it does matter.
In terms of balancing for a Game Population at large, you have to account for the middle/low skill players. You cannot get around them existing, and so they MUST be factored as part of the playerbase.
There was an excellent thread which talked about how CVs could be altered to lower the capability of the Unicums in a CV.
https://forum.worldofwarships.com/topic/248673-nerf-the-cvs-not-the-players/