Yes, the report I read was of a tripod. Stand and shoot, swivel tripods for ARs are available, and would make more sense in this particular application.
If you run across a link to one of those stand-up AR tripods, please pass it along!
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Of course, I'm sure I could quickly rig a clamp or cradle that attaches to the 1/4-20 stud on a camera tripod -- or, better yet, the smaller of my telescope tripods, which is far sturdier...
But, I have no reason to do so, since I have a good bench at my range, and prefer to shoot from pads, rather than hard rests... [Besides, we octogenerian old coots would rather sit than stand -- any day...] '-)