Your comment wasn't deleted. Are you sure you don't have it minimized? (The minus sign next to it.)
Nah it only returned after my comment here
You sure it wasn't database coherency or some other issue on the tech side? Comments are basically never ever deleted here. Even the most vile racist or ableist or homophobic comments just get flagged to death and left up.
Maybe
Their earlier comment got flagged to death and they missed it when they looked.