This guy wasn't a novice, yet he appears to have made a novice mistake (apparently flying near the aircraft limits of performance near mountainous terrain).
There are some pilots for whom a mistake of this type is "out of character". I'd call this "out of character".
Downdrafts near the ground are very possible. The wind only goes horizontal at ground level because it has nowhere else to go.
It does however have this swirling motion in the vertical plane if you could see it, which means there are updrafts at ground level, too.
"Inconclusive" doesn't mean there wasn't a plausible explanation. It just means that they couldn't find an obvious problem that could cause a crash.
I wouldn't rule out suicide. It happens.
ECAM Actions.