It never ceases to amaze me how little nexon employees know about their games. A simple test on a closed server would have verified if their translation was correct or not. Misinformation like this causes huge problems for players in their games and is almost never fairly compensated or fixed in a timely manor.
I copy-paste following line by line before starting Dullahan:Seems to helpQuick summary:
1) Try to pull him away from the middle early on
2) Stun in party order when he's going to break the thing in mid
3) Aim his "collar" with bombs to separate soul
4) Someone needs to keep ghost busy - away from Dullahan
5) Get away from boss when red mark appeared on you - ghost will tp
6) At x4 he will go mid to cast blizzard - back off
7) Stay inside circle during blizzard