Unless you are one of the few that never played Horde side, literally the whole reason for Horde/Ally conflict in Legion was based on a misunderstanding, yet it's one of the main reasons cited at Blizzcon for why there is conflict between the factions in BFA.
I would say the odds of Teldrassil burning being any different are slim to none at all.
But let's not let that stop people from taking unconfirmed rumors and baseless speculation as gospel.