Time doesn’t follow rules in WoW (does anything?).
During the DK campaign in Legion, the Lich King says “It’s been 2 years since the events at Icecrown Citadel.”
When I heard that, I was like “whaaaaa??? TWO years??? It’s been like SEVEN, bro!”
There are SOOOOO many examples of this, it’s just like trying to follow the story in general: at some point you just throw up your hands and give up.