It's the opening scene to the Heavensward expansion though... which is why it has said spoiler. And given the fact what happens in that scene even by the time of Heavensward's launch was already pretty much common knowledge, SE must have just accepted that it's like Aeris's death in FFVII at this stage - as it's pretty much well known by most players what happens, trying to hide it would just look silly.

It was also previously available on Youtube months before with a spoiler warning, so again, I guess they must have just felt everyone would know by now. Either way, it's really not relevant anymore.