Can theater AI really achieve that?
Eh, note the number of opposing units.
On the first screen Yugoslavia got 1 (!) division to cover 6 border provinces. On the second, you can see 5 divisions covering what it appears to be 12 province long front.
Of course AI that got more units was able to deal with such opponent. I would be extrememly suprisied it it wasn't.
I wonder how it can deal with more demanding opponent - with comparable number of units for a start, maybe even smart (read - human) enough to group them in right spots and using air force to delay enemy/support own counterattacks.
Don't get me wrong, but while it's good that Theater AI is capable of doing stuff like preparing for assault, then counducting it, nothing in this AAR indicates, it's doing it well. Opponent is just grossly outclassed quantity-wise.