No, it’s not my opinion that BfA is new. Because it is the current expansion.
“Exciting” is what Blizzard would call current content. That is again not my opinion : it’s a fact that this is the “marketing speak” used to describe the current expansion at all times in the history of about every game.
They literally stated that is their goal for previous expansion raids. They want people to still group up so they don’t enable the “Old content buff” on purpose and don’t nerf mechanics that can’t be solo’ed right away.