You're right, that tactical nuke wouldn't create a crater... because it's an AIR-2 Genie air-to-air nuclear rocket designed to attack bomber formations being used in an A2A configuration.
Forget for a minute the blast yield of that device and instead look at where it's detonated. Air burst detonations maximize the blast effect of the device. For this tomahawk that's shrapnel formation and fireball propagation, but there's little to no effect on the ground beneath the blast.
You'll notice the same with Shot Grable, 15 kt at 524 feet, part of the Operation Upshot-Knothole series of nuclear artillery shell tests.
Again, full fireball propagation, but limited ground effect because the blast isn't concentrated on that point. Now what do you suppose would happen with a nuclear penetrator like the variable yield B-61?
Would the fireball be as pronounced? Would the blast effect effect the ground in the same way? Nope, it'd look like this.
Oh, by the way, that's a W-25 in that picture. Same warhead as used on the AIR-2 Genie in the video you posted
. During the that test the blast yield of the device was a mere 1.7 kt.
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