I think the important thing is consistency.
Alright, this is what the Pennington play-by-play looked like-
2-1-SD 1 (1:27) 10-C.Pennington FUMBLES (Aborted) at SD 1, ball out of bounds in End Zone, Touchback.
There was a play like this one week earlier, in the NO/Phi game-
4-14-NO 1 (3:41) 9-D.Brees right end to NO -9 for -10 yards. FUMBLES, ball out of bounds in End Zone, SAFETY.Fleaflicker scored
the Brees play as a safety, but not a fumble-
1 point for every Sack applied to 2 Sacks 2
2 points for every Interception applied to 1 Interception 2
2 points for every Safety applied to 1 Safety 2
-4 extra points when total Offensive Points Allowed (FG, Pass TD, Rush TD) is greater than or equal to 28 applied to 36 Offensive Points Allowed (FG, Pass TD, Rush TD) -4
While there is a difference (the Brees fumble occurred in the endzone, resulting in a safety), they were both fumbles and both times the ball fumbled out of bounds in the endzone. So, I'd say the play shouldn't be counted as a fumble recovery, because a previous play almost exactly like it wasn't counted as a fumble recovery either.