Very interesting.
This passage reiterates, once again, that Jaina was the HEAD of the Kirin Tor.
“B-BUT WHY DIDN’T SHE ASK THE COUNCIL OF SIX!!!”
Because she was the HEAD of the Kirin Tor. She out-ranks the Council of Six, as Antonidas did. Last I checked, Antonidas didn’t need the Council to decide for Dalaran that they would join the Alliance and the Second War. So, by that same logic, Jaina was within her legal rights to expel the Sunreaveers from the city-state that she ruled. She outranked the Council of Six.
This passage also suggests that the event is not nearly as “bloody” as some people here think. Come to think of it, where does the “Purge of Dalaran” name even come from? Is it mentioned anywhere in a quest text?
Anyway, the Sunreavers were simply “expelled” from Dalaran. Not slaughtered or exterminated. “Expelled”. Aka, they were not killed.