The waves observed being not merely compression (sound) waves, but gravity waves, in which the air column itself is transported vertically.

Implications and impacts of this are as yet unknown, but the results might include mixing between atmospheric regions, impacts on satellites (increased drag for very-low-orbiting craft), the speed at which the waves propagate (atmospheric gravity waves should be slower than compression blast waves), cloud patterns (lifted humid air would tend to condense out, then re-vaporise, at it is lifted and lowered).

What's changed in particular is our ability to observe, from multiple instruments and points of view, events of this magnitude. New sensors -> new observable phenomena.