+170º Elevation?

So with the turret facing forward, after the gun becomes completely vertical it can now swing to point literally backwards to form a 10º angle with the upper part of the rear of the vehicle? That would be an almost ridiculous design (for starters, why would a 90º+ degree elevation be desirable at all? Maybe someone thought the vehicle should be able to self-destruct that way?). Obviously there's a mistake, both in the article and the source. 

The vehicle has a +70º elevation, which seems more logical. (FOSS, CHRISTOPHER F. "Jane's Tanks and combat vehicles recognition guide" 2ed. Harper Collins 2000, pp.432)

I believe the article should be corrected.