I guess I could see your perspective when you say that you dislike the rule. However, I don’t see how the rule is “unfair”. It applies to each player equally.
Hard to say. In the end you need to live with the penalty that resulted from your rule infraction.
You are technically correct here. The cup has been going since May 2024 and the new penalty specification has been added in November 2024. This is obviously not ideal. One thing is that the tournament does not have its own ruleset but instead relies on the KBA rules. So this was not something the tournament organizers did intentionally. Then you also have to see that this tournament goes almost the whole year so naturally it is difficult for a KBA rule change to take place outside of the running tournament. But most importantly the Korean rules have always specified that the captured stones shall be put into the lid. It is just that the ruleset was updated in November 2024 to specifiy how exactly this rule infraction shall be handled.
You are wrong.
This is also wrong.
Players pointing out rule infractions of their opponents is pretty much the norm in sports.