It also seems to be quite precise. They probably put a cheap GPS/Glonass receiver inside with movable wings
An autogyro and GLONASS receiver and make the tail fins moveable to steer the bomb should be fine.
Go to 14:33. Thr fume extractors on the t-64/t-80 and t-72/t-90 variants is very minimal and indeed particularly with apfsds lots of smoke comes back into the cabin, where it is then sucked away via the ventilation system.
If you look carefully a lot is sucked out of the small hatch that ejects the shell case, plus the fact that the camera is positioned behind the crewman where most of the smoke goes behind the gun between the two turret crew and is dispersed relatively quickly.
The gunner will say when they fire so holding your breath for 20 seconds and you might not even breath in any fumes at all.
How many units are there?
None. The Black Eagle was never actually made, only a mockup vehicle was driven around defence expos, but they never actually made any AFAIK... ammo in the turret bustle was considered to be too exposed to enemy fire and AFAIK there was never any version with a 152mm calibre gun.
Did you watch your own video with the volume on ? The smoke is gone in seconds. And the commentator says it. WTF more do you want or need?
More importantly use your depth perception to see where the smoke actually is and where it goes... it appears directly behind the gun and disappears rather quickly without suffocating either the gunner or commanders position... if they turret was larger the loader standing behind the gun would get enveloped in smoke, but he does not exist in this tank.
Yet there is one of the project leaders on the newest T-90 mod highlighting efforts to deal with gases from the gun. Hardly sexy stuff on a tank.
Compared to the smoke and flame coming out the other end, this smoke is nothing to be worried about... the gun has a fume extractor attached to it... the small amount of smoke that enters the crew compartment is not around long enough to worry too much about.
BTW thanks for posting those photos of the Hind Hole, that first photo from below I thought those anti missile turrets were mounted on the wing in between the inner wing pylons and the cabin, but the other shot showed they were mounted on the lower fuselage... nice catch... hadn't seen those at airshows or arms fairs before.