Yep, that's hard to attribute to an attacker with maximum effort, so should count as one of those extremely rare own goals. My guess (without having seen all the games) is that it's just 1-2 in the tournament, and that the figure historically has been just 0..2 as well. What would stand out would be if there were 4-5 such goals in a tournament. Not that there is a dozen of the "defender own-goals from the goal-line" type.