Why is this in 'Endgame study'?
Why not? The game has obviously ended.
Ok, this position is not an ending. It does not bother me at all. It is not uncommon to see off-topic posts.
While every game ends (like this one), not every game reaches an ending.
Ending: few pieces left on the board (rough definition).
I am just providing useful information, not criticizing anybody for posting off-topic.
Why is this in 'Endgame study'?
Why not? The game has obviously ended.
Because it's in the opening
OK. It's in the opening, but it's still ended. All positions are endgame positions, it's just that some are deeper than others.
Really?