I can’t read that, but they are likely bringing it in line with the rest of the Regions. Korea has some different laws which might have impacted how many accounts a person can have prior? I honestly don’t know.
What I do want to clarify though is that you can have as many Bnet accounts as you want - provided they are in your legal name.
What you can’t have is more than 3 with Battlenet Balance on them.
From Section D2a
And, while you can register and play on multiple Accounts, you are not allowed to have more than three (3) Accounts with Battle.net Balance.