Perhaps by "62 miles from impact", the president meant that the thing stopped 62 miles away from the point it would have started seriously wrecking shit up, as opposed to 62 miles from the surface per se?
The Russian boom wasn't because the meteor was 62 miles up. The boom was because that's where the deceleration caused it to come apart, liberating basically all it's kinetic energy in an instant. The evil was stopped by the beam, not by the atmosphere--either there's no effect or the energy is liberated at the temple. In neither case do you get a huge boom 62 miles up.