[Chad C. Mulligan]

The airframe is nothing spectacular, but the control systems are. That thing is at best only marginally stable, so the controls have to manage that, in addition to navigating. But once you have the chips and the software licked, the thing is infinitely scaleable. The only battlefield limit I can see is how many you can launch before the enemy's artillery finds you. As a weapon for infiltrators it's golden, as the Ukrainians seem to be demonstrating. Not enough warhead to be effective against serious armor, but no thin-skinned vehicle will be safe. Especially parked aircraft.

[Yardstick]

That thing is at best only marginally stable
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I’m no expert but I remember from my RC airplane days that a flat bottom airfoil was the most stable profile. That is what this drone has.

OTOH, the wing has little or no dihedral angle — which is to say it extends straight out rather than rising towards the tips. A flat wing with low dihedral is a less stable configuration IIRC.

And it looks like the distance from the CG to the vertical stabilizer is unusually short, which I could see reducing stability.

But to my eyeball it doesn’t look fundamentally unstable.

What is it that makes you say it’s unstable?