I was told by many people and read some sources that a massive global ban on international players. and I can confirm that the notice has nothing to do with bans regarding international players. The notice was an apology for people not able to login during 4/10 18:09～21:20 due to a glitch within LG/Hangame security system. The system was intended to ban bots and gold sellers from international regions. However, the system had put some users on false positive and prevented players from login. There was a public apology and an AR Card was given in terms of compensation.
Overall, there are NO bans given to international players. It should be safe to login after the maintenance.
Translation by: takisse
Source: LG/Hangame (Original Notice)
Do NOT PM me for game related questions! Use Discord Chat or Forums for Support.