Well for starters you did not say that supernovae are >7 orders of magnitude slower than hydrogen bomb explosions, and it sounds an awful lot like you misinterp

Well for starters you did not say that supernovae are >7 orders of magnitude slower than hydrogen bomb explosions, and it sounds an awful lot like you misinterpreted the original statement as referring to a supernova 4 lightyears away, which would coincidentally lower the value by about 9 orders of magnitude.