Concrete proof finally provided that the 2002 error has NOTHING is server side issue

[Divinemights]

Did you read the google doc and the investigation the person did?

Yes, I did.
It is a theory, not a proof.
I also said it is suggestions because whatever Japanese is suggest is also a theory
No IT tech is able to recreate same environment for each player's system
I only can tell you SE is not intend to lie about 2002 because their IT is truly believed it is client side issue.
This is a blog from a Japanese player in regard to 2002 at year 2014 (not provide name due to privacy:

2014/02/06 09:49 3
ロビーサーバー接続でエラー2002の対処法
[エラー2002]
公開
昨日からエラーで入れなかった件ですが

GAME　START

をクリックしましてデータセンターに接続表示後

ロビーサーバー接続でエラーが発生しました（2002）

と出て入れなかったわけですが

問い合わせメールの返信が来ました。内容は最後にコピペしときます。

自分の原因はですがセキュリティーソフトのバグ？でした。

普通でない状態だったらしく立ち上げて更新とかクイックスキャンとかできることを片っ端からやって閉じたら

FF14に入れるようになってました。このエラーは向こうに原因はなくPCか回線の問題みたいですね。

ともかく入れてよかった。


ではコピペ

Basically, SE IT tech inform him 2002 is player's PC connection issue and this JP player fixed it by turn off the antivirus program: there is a bug with security soft (セキュリティーソフトのバグ)

After the patch, I on average only encounter 2002 twice and my system environment is cleaner than most of FF14 players because this system is dedicate to gaming only. No other 3rd party software including discord. I bought the new wifi6 router, i will update if i am still getting same 2002 frequency
The question is, as a game producer, who should Yoship believe? His own IT tech team who able to provide steady service before WoW exodus or some google document and no idea who the author is?