Honestly, no idea. I just know the reporting says it was drones. If it was, say, a Storm Shadow, I don’t see the point in lying about it. The Russians are going to know the truth eventually from analyzing their radar feed. And I would think we would want the Russians to know if it was weapons we provided, and that there are more where that came from.
I’ve seen the satellite photos and some videos from when they opened it in 2019. Can’t guarantee the workmanship but it looked to be properly done. It had plenty of berms as well to help contain/redirect explosions upward.