Flying wing example: No sweep, no "vertical stabilisers"

I'm often told that flying wings need winglets or "vertical stabilisers" as people call them. I think in the future I'll point them to this video. The wing has no sweep (barely), no winglets and no drag rudders/split ailerons. To tell you the truth, I'm perplexed as to how this wing even has any yaw stability. I wonder if it's from the drag differential from yaw rate.

Edit: Does it have drag rudders/split airlerons?

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