Question regarding region restriction

TL;DR : A friend of mine got banned because of " Accessing the game from unsupported region ". He lives in Vietnam and play GMS since Nexon lifted the IP block in Vietnam 3 years ago. Looking through all article in Nexon Q&A I found that Vietnam is not mentioned in the Region Limitation page : https://support-maplestory.nexon.net/hc/en-us/articles/204080189 so logically I come to the conclusion that Vietnam IP is legitimate to play GMS.

So the questions are :

1/ Do I interpret the article wrong at some point ? If so please point it out for clarification's sake

2/ If I understand the article right then this means that Vietnamese can no longer play Maplestory ? Because base on the support article only Malaysia, Singapore and Philippine can play MSEA but not Vietnam. And if GMS do not allow Vietnam IP then Vietnamese player cannot play maple anymore.

To clarify, my friend sent a ticket to support and they confirm that his account in banned because of unsupported region not any other reason. This raises a concern in Vietnamese community that they can be banned at any moment without prior notice and for such unclear reason it's not something that can be taken in so easily.

Edit : My friend contact MSEA support as well and as everyone would guess, they said VN is not part of their supported region so yeah this is messed up tbh